2003 Chevrolet Silverado 1500 Air Intakes

Essential 2003 Chevrolet Silverado 1500 Air Intakes

Dorman – GM Bumper Retainer (Part No.961-364D)

GM Bumper Retainer

from

$4.49
Constructed of quality materials, this multi-purpose retainer provides the same function and versatility as the original equipment retainer ensuring long service life.

Product Features:
  • Ideal replacement – this retainer matches the fit and function of the original equipment retainer for this vehicle application
  • Quality material – this retainer is made of durable material for long-lasting service
  • Versatile design – this retainer is suitable for a variety of automotive uses
  • Excellent value – this part offers original equipment quality at a competitive cost
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Dorman – Nylon Nut – 1/4 In. (No.14) (Part No.961-351D)

Nylon Nut - 1/4 In. (No.14)

from

$4.49
Constructed of quality materials, this multi-purpose retainer provides the same function and versatility as the original equipment retainer ensuring long service life.

Product Features:
  • Ideal replacement – this retainer matches the fit and function of the original equipment retainer for this vehicle application
  • Quality material – this retainer is made of durable material for long-lasting service
  • Versatile design – this retainer is suitable for a variety of automotive uses
  • Excellent value – this part offers original equipment quality at a competitive cost
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Dorman – Remanufactured Throttle Actuator Control Module (Part No.599-959)

Remanufactured Throttle Actuator Control Module

from

$355.99
This electronic throttle body module is a reliable direct replacement for the original equipment module on specific vehicles. It is thoroughly tested to restore proper performance.

Product Features:
  • Direct replacement – this throttle actuator control module directly replaces the original module on certain vehicle applications
  • Effective fix – this module restores proper throttle body operation to ensure maximum efficiency
  • Durable materials – high-grade electronic components withstand extreme temperature fluctuations to prevent future failures
  • Trustworthy quality – backed by team of engineers in the United States
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Hitachi – Electronic Throttle Body: New (Part No.ETB0025)

Electronic Throttle Body: New

from

$209.99
Hitachi’s Electronic Throttle Bodies (ETBs) are designed to provide extraordinary accuracy with quick response times. High quality materials ensure that even under the most extreme conditions, Hitachi’s ETBs will not deform or malfunction. Precision Throttle Position Sensor (TPS) Circuitry maintains accurate engine mapping resulting in optimal fuel economy and performance with the lowest possible emissions. Details such as internal gear sizes, tooth count, materials, and protected circuitry provide a durable and reliable product. Designed to meet the exact needs of each specific vehicle, Hitachi’s electronic throttle bodies are the premium choice.

Product Features:
  • Advanced throttle position sensor technology ensures smooth idle conditions and precise air flow metering
  • Hitachi is a Tier 1 OE supplier for Throttle bodies
  • 100% NEW, never remanufactured
  • Precision TPS Circuitry maintains accurate engine mapping; Pemium componentry allows for extended durability; Tailored for each vehicle to reduce install times.
  • These quality Electronic Throttle Bodies feature precise throttle opening, improved fuel economy and reduced emissions.
  • Powerful electric motor provides quick and accurate response for optimal engine efficiency
  • Electronics are sealed to prevent contamination that may result in inaccurate readings
  • Detailed manufacturing tracking system using QR codes
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Mr. Gasket – Intake Manifold Bolts (Part No.955G)

Intake Manifold Bolts

from

$15.49
These grade 5 socket head bolts are zinc plated for protection and appearance. Hardened flat washers provide uniform torque & prevent galling on aluminum manifolds. Includes twelve (12) 3/8-16 x 1 inch bolts & washers.

Product Features:
  • Grade 5 socket head bolts are zinc plated for protection and appearance
  • Hardened flat washers provide uniform torque & prevent galling on aluminum manifolds
  • Washers Included
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MAHLE Original – Intake Manifold Bolt Set (Part No.GS33561)

Intake Manifold Bolt Set

from

$38.99
MAHLE gaskets provide world class sealing products trusted by OEMs & Technicians around the globe.

Product Features:
  • All MAHLE gaskets meet or exceed the original equipment specifications providing the finest sealing products available
  • MAHLE gaskets utilizes OE equivalent or better materials in all our gaskets
  • MAHLE gaskets is the leader in Domestic, Asian and European applications
  • The contents of MAHLE gaskets are packaged in shrink wrapped tray, giving you the added security of knowing that you have the right parts, prior to opening the package
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Dorman – Push-Type Rocker And Fender Liner Retainer – 3/8 In. Hole (Part No.963-122D)

Push-Type Rocker And Fender Liner Retainer - 3/8 In. Hole

from

$4.49
Constructed of quality materials, this multi-purpose retainer provides the same function and versatility as the original equipment retainer ensuring long service life.

Product Features:
  • Ideal replacement – this retainer matches the fit and function of the original equipment retainer for this vehicle application
  • Quality material – this retainer is made of durable material for long-lasting service
  • Versatile design – this retainer is suitable for a variety of automotive uses
  • Excellent value – this part offers original equipment quality at a competitive cost
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Dorman – GM Drive Type Rivet (Part No.963-208D)

GM Drive Type Rivet

from

$4.49
Constructed of quality materials, this multi-purpose retainer provides the same function and versatility as the original equipment retainer ensuring long service life.

Product Features:
  • Ideal replacement – this retainer matches the fit and function of the original equipment retainer for this vehicle application
  • Quality material – this retainer is made of durable material for long-lasting service
  • Versatile design – this retainer is suitable for a variety of automotive uses
  • Excellent value – this part offers original equipment quality at a competitive cost
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aFe POWER – Throttle Body Spacer (Part No.46-34001)

Throttle Body Spacer

from

$139.99
Silver Bullet throttle body spacers create turbulence in the air flow at the point just prior entry into the engine increasing horsepower, torque and improving throttle response and fuel efficiency. Silver Bullet throttle body spacers are constructed out of durable T-6061 billet aluminum and using a unique serrated/helix entry to create turbulence at the manifold while eliminating the annoying whistle found in other helix only throttle spacers.

Product Features:
  • Precision Machined From T-6061 Billet Aluminum
  • Special Helix Design
  • Produces Increased HP/Torque/Throttle Response
  • Fits w/aFe Intakes
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aFe POWER – Throttle Body Spacer (Part No.46-34003)

Throttle Body Spacer

from

$139.99
Silver Bullet throttle body spacers create turbulence in the air flow at the point just prior entry into the engine increasing horsepower, torque and improving throttle response and fuel efficiency. Silver Bullet throttle body spacers are constructed out of durable T-6061 billet aluminum and using a unique serrated/helix entry to create turbulence at the manifold while eliminating the annoying whistle found in other helix only throttle spacers.

Product Features:
  • Precision Machined From T-6061 Billet Aluminum
  • Special Helix Design
  • Produces Increased HP/Torque/Throttle Response
  • Fits w/aFe Intakes
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Carquest Premium – Throttle Position Sensor w/ Hardware (Part No.ECC1005)

Throttle Position Sensor w/ Hardware

from

$57.99
MotoRad Throttle Position Sensors offer precision signaling to the ECM to ensure optimum performance and fuel economy. Manufactured using the highest quality OEM approved materials, resulting in tighter tolerances and increased durability. All MotoRad Throttle Position Sensors are designed to meet or exceed OEM specifications at our ISO TS16949 manufacturing facilities.

Product Features:
  • Manufactured to provide superior sealing, protecting against all engine bay contaminants and insulation from extreme hot and cold temperatures.
  • 100% calibrated and end-of-line tested to ensure worry-free, out-of-the-box performance
  • Designed to meet or exceed all OEM specifications in fit, form & function
  • Extensive product testing includes salt spray, high/low temperature impact, thermal vibration, durability, static electricity, and micro tension, among other tests, to ensure all sensors meet or exceed OEM specifications.
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NTK – Throttle Position Sensor (Part No.TH0006)

Throttle Position Sensor

from

$56.99
Building upon a foundation of premium full-line products established under NGK ignition and NTK oxygen sensor products, NTK’s expansion to technical sensors is part of our ongoing commitment to streamline product types and increase coverage under one premium brand: NTK, The Sensor Specialist. With over 80 years of automotive expertise, NGK’s family of automotive products are driven by extreme dedication to innovation, performance and quality. NTK is the only OE supplier with a full-line of technical sensors in the aftermarket for import and domestic vehicles. Drawing from OE experience, NTK sensors undergo extreme testing conditions that include thermal shock, vibration and OBD verification. NTK sensors are manufactured to ensure a quality that meets or exceeds OE specifications. As new vehicles incorporate connected and automated technologies, trust The Sensor Specialist for full-line market support and OE application technology.

Product Features:
  • NTK’s Throttle Position Sensors are manufactured to operational performance standards to meet or exceed OE fit, form and function to ensure proper feedback to the ECU to control engine performance.
  • The Throttle Position Sensor (TPS) reports the angle of the throttle plate to the PCM for optimal engine operation under all engine load conditions.
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GM Genuine Parts – Fuel Injection Throttle Body Seal (Part No.17113561)

Fuel Injection Throttle Body Seal

from

$19.99
GM Genuine Parts Fuel Injection Throttle Body Seals are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These seals help provide an air- and liquid-tight connection between throttle body components, and are GM-recommended replacements for your vehicle’s original components. Replace this seal whenever you service the throttle body. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).

Product Features:
  • Helps prevent excess air form entering the intake
  • Helps seal the intake and throttle from the elements
  • Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
  • GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
  • GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
  • GM regularly updates production and service part designs to integrate new materials and technologies
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GM Genuine Parts – SEAL,THROT BODY (Part No.217-2424)

SEAL,THROT BODY

from

$33.99
GM Genuine Parts Fuel Injection Throttle Body Seals are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These seals help provide an air- and liquid-tight connection between throttle body components, and are GM-recommended replacements for your vehicle’s original components. Replace this seal whenever you service the throttle body. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).

Product Features:
  • Helps prevent excess air form entering the intake
  • Helps seal the intake and throttle from the elements
  • Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
  • GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
  • GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
  • GM regularly updates production and service part designs to integrate new materials and technologies
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Felpro – Engine Intake Manifold Gasket Set (Part No.MS 97402)

Engine Intake Manifold Gasket Set

from

$25.99
Fel-Pro gaskets offer 100% vehicle sealing with application-specific materials to give you sealing solutions with the performance and durability professionals trust

Product Features:
  • DESIGNED FOR IMPERFECT SEALING SURFACES — Engineered and manufactured specifically for the repair environment to help seal imperfect sealing surfaces
  • SEALING TECHNOLOGIES — Exclusive sealing innovations and technologies with proprietary materials and unique design features to ensure a superior seal for your repair
  • ENGINEERING EXPERTISE — Parts are designed, reviewed, validated and approved by Fel-Pro engineers through rigorous research and development
  • REAL-WORLD TESTED — Parts are tested on-vehicle and validated to ensure optimal performance on the road
  • EVERY PART FOR THE REPAIR — Fel-Pro gasket sets include every part needed for the repair unless otherwise noted
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MAHLE Original – Intake Manifold Gasket Set (Part No.MS16340)

Intake Manifold Gasket Set

from

$71.99
MAHLE gaskets provide world class sealing products trusted by OEMs & Technicians around the globe.

Product Features:
  • All MAHLE gaskets meet or exceed the original equipment specifications providing the finest sealing products available
  • MAHLE gaskets utilizes OE equivalent or better materials in all our gaskets
  • Intake manifold gasket set contains manifold gasket(s) needed to replace an intake manifold.
  • The contents of MAHLE gaskets are packaged in shrink wrapped tray, giving you the added security of knowing that you have the right parts, prior to opening the package
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Dorman – Body Bolt With Washer – M6-1.0 X 25mm (sold by each) (Part No.700-251)

Body Bolt With Washer - M6-1.0 X 25mm (sold by each)

from

$1.29
These nuts are manufactured using durable materials and corrosion tested to ensure required strength and longevity.

Product Features:
  • Durable materials – manufactured to specific thread tolerance standards
  • Corrosion tested – hardware undergoes salt spray testing to ensure corrosion resistance
  • Multipurpose usefulness – can be used in a variety of applications, from auto to home
  • Trustworthy quality – backed by team of professional engineers and quality control specialists in the United States
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Dorman – Electronic Throttle Body: New (Part No.977-014)

Electronic Throttle Body: New

from

$317.99
When a vehicle idles roughly, displays a malfunction indicator lamp or sets DTCs, the cause might be oil ingress or dirt and carbon buildup in the electronic throttle body. This 100% new electronic throttle body is designed to match the fit and function of the original equipment throttle body on specified vehicles. It features a non-contact Hall effect sensor and proprietary Sensor Shield butterfly shaft seal to help prevent future failures.

Product Features:
  • Upgraded design – this plug-and-play replacement throttle body features a contactless Hall effect sensor and proprietary Sensor Shield butterfly shaft seal to prevent future failures
  • New construction – 100% new case aluminum, not remanufactured, for reliability and the convenience of no core charge
  • Rigorously tested – complies with Federal Motor Vehicle Safety Standards (FMVSS) and endurance-proven with over 1 million cycle tests
  • Trustworthy quality – vehicle try-on tested, and backed by a team of product experts in the United States and more than a century of automotive experience
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Hitachi – Electronic Throttle Body: New (Part No.ETB0066)

Electronic Throttle Body: New

from

$251.99
Hitachi’s Electronic Throttle Bodies (ETBs) are designed to provide extraordinary accuracy with quick response times. High quality materials ensure that even under the most extreme conditions, Hitachi’s ETBs will not deform or malfunction. Precision Throttle Position Sensor (TPS) Circuitry maintains accurate engine mapping resulting in optimal fuel economy and performance with the lowest possible emissions. Details such as internal gear sizes, tooth count, materials, and protected circuitry provide a durable and reliable product. Designed to meet the exact needs of each specific vehicle, Hitachi’s electronic throttle bodies are the premium choice.

Product Features:
  • Advanced throttle position sensor technology ensures smooth idle conditions and precise air flow metering
  • Hitachi is a Tier 1 OE supplier for Throttle bodies
  • 100% NEW, never remanufactured
  • Precision TPS Circuitry maintains accurate engine mapping; Pemium componentry allows for extended durability; Tailored for each vehicle to reduce install times.
  • These quality Electronic Throttle Bodies feature precise throttle opening, improved fuel economy and reduced emissions.
  • Powerful electric motor provides quick and accurate response for optimal engine efficiency
  • Electronics are sealed to prevent contamination that may result in inaccurate readings
  • Detailed manufacturing tracking system using QR codes
See More

ACDelco – GM Original Equipment Fuel Injection Throttle Body Gasket (Part No.C7001291899ACD)

GM Original Equipment Fuel Injection Throttle Body Gasket

from

$44.77
The ACDelco GM Original Equipment Fuel Injection Throttle Body Gasket is a GM-recommended replacement component that provides the same performance, durability, and service life as your factory original equipment.

Product Features:
  • GM-recommended replacement part for your GM vehicle’s original factory component
  • Offering the quality, reliability, and durability of GM OE
  • Manufactured to GM OE specification for fit, form, and function
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Felpro – Fuel Injection Throttle Body Mounting Gasket (Part No.61507)

Fuel Injection Throttle Body Mounting Gasket

from

$4.29
Fel-Pro gaskets offer 100% vehicle sealing with application-specific materials to give you sealing solutions with the performance and durability professionals trust

Product Features:
  • Meets or exceeds all original equipment specifications
  • Application specific design to ensure a perfect fit
  • Engineered and manufactured specifically for the repair environment
  • Unsurpassed quality you can trust
  • Validated for fit, form, and function
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Dorman – Engine Air Intake Hose (Part No.696-401)

Engine Air Intake Hose

from

$15.99
This engine air intake hose was designed as a direct replacement for the original equipment intake hose. Engineered for a perfect fit and easy installation, it includes all necessary fittings. Made of quality materials for a long service life.

Product Features:
  • Direct replacement – fits and functions like original equipment
  • Quality construction – manufactured from premium materials for a long service life
  • Excellent value – original equipment quality at a lower price
  • Quality tested – has undergone testing to ensure proper fit and performance
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Dorman – Engine Air Intake Hose (Part No.696-402)

Engine Air Intake Hose

from

$162.99
This engine air intake hose was designed as a direct replacement for the original equipment intake hose. Engineered for a perfect fit and easy installation, it includes all necessary fittings. Made of quality materials for a long service life..

Product Features:
  • Direct replacement – fits and functions like original equipment.
  • Quality construction – manufactured from premium materials for a long service life
  • Excellent value – original equipment quality at a lower price
  • Quality tested – has undergone testing to ensure proper fit and performance
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NTK – Air Charge Temperature Sensor (Part No.EF0008)

Air Charge Temperature Sensor

from

$25.99
Building upon a foundation of premium full-line products established under NGK ignition and NTK oxygen sensor products, NTK’s expansion to technical sensors is part of our ongoing commitment to streamline product types and increase coverage under one premium brand: NTK, The Sensor Specialist. With over 80 years of automotive expertise, NGK’s family of automotive products are driven by extreme dedication to innovation, performance and quality. NTK is the only OE supplier with a full-line of technical sensors in the aftermarket for import and domestic vehicles. Drawing from OE experience, NTK sensors undergo extreme testing conditions that include thermal shock, vibration and OBD verification. NTK sensors are manufactured to ensure a quality that meets or exceeds OE specifications. As new vehicles incorporate connected and automated technologies, trust The Sensor Specialist for full-line market support and OE application technology.

Product Features:
  • Air Charge Temperature Sensors are designed to meet or exceed OE specifications in form, fit and function to ensure proper monitoring of air temperature entering the engine
  • NTK’s Engine Coolant Temperature Sensors are manufactured to operational performance standards to meet or exceed OE fit, form and function to ensure proper engine operating temperature.
  • Engine Coolant Temperature (ECT) Sensors measure the temperature of the coolant. The readings from the (ECT) sensor are sent back to the Engine Control Unit (ECU) to adjust the fuel injection and ignition timing.
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Dorman – Plastic Intake Manifold – Includes Gaskets (Part No.615-183)

Plastic Intake Manifold - Includes Gaskets

from

$572.99
This engine intake manifold was precision-engineered and durably manufactured to match the fit and function of the original manifold on specified vehicles. It is thoroughly tested to ensure top-quality OEM construction and superior reliability.

Product Features:
  • Ideal replacement – this intake manifold was precision-engineered and durably manufactured to match the fit and function of the stock manifold on specified vehicles
  • Reliable construction – tested to ensure top-quality OEM performance and durability
  • Perfect fit – designed to match all specifications of the original part for convenient, trouble-free installation
  • Trustworthy design – built by the industry leader in aftermarket manifolds
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ACDelco – Intake Manifold (Part No.B1200580190ACD)

Intake Manifold

from

$360.82
Intake Manifold

ACDelco – GM Original Equipment Intake Manifold Assembly (Part No.B1200580181ACD)

GM Original Equipment Intake Manifold Assembly

from

$271.19
The ACDelco GM Original Equipment Engine Intake Manifold is a GM-recommended replacement for your vehicle’s original component. The intake manifold evenly distributes the incoming engine air to each of the cylinders, ensuring the proper amount of air mixes with the proper amount of fuel. This original equipment engine intake manifold has been manufactured to fit your specific GM vehicle, providing the same performance, durability, and service life you expect from General Motors.

Product Features:
  • Thermoplastic, aluminum, and cast iron intake manifolds available for a wide range of applications
  • Designs are enhanced and amended to incorporate updates, upgrades, and Technical Service Bulletins
  • GM-recommended replacement part for your GM vehicle’s original factory component
  • Offering the quality, reliability, and durability of GM OE
  • Manufactured to GM OE specification for fit, form, and function
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ACDelco – GM Original Equipment Intake Manifold Assembly (Part No.B1200580201ACD)

GM Original Equipment Intake Manifold Assembly

from

$246.73
The ACDelco GM Original Equipment Engine Intake Manifold is a GM-recommended replacement for your vehicle’s original component. The intake manifold evenly distributes the incoming engine air to each of the cylinders, ensuring the proper amount of air mixes with the proper amount of fuel. This original equipment engine intake manifold has been manufactured to fit your specific GM vehicle, providing the same performance, durability, and service life you expect from General Motors.

Product Features:
  • Thermoplastic, aluminum, and cast iron intake manifolds available for a wide range of applications
  • Designs are enhanced and amended to incorporate updates, upgrades, and Technical Service Bulletins
  • GM-recommended replacement part for your GM vehicle’s original factory component
  • Offering the quality, reliability, and durability of GM OE
  • Manufactured to GM OE specification for fit, form, and function
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2003 Chevrolet Silverado 1500 Air Intakes

You count on your 2003 Chevrolet Silverado 1500 to run right. That means taking care of it with regular maintenance, necessary repairs, and the right parts. Advance Auto Parts can help with all of that thanks to our extensive inventory of trusted Air Intakes. With 37 Air Intakes ranging in price from $1.29 to $572.99, you’re sure to find everything you need for your 2003 Chevrolet Silverado 1500.

Brands matter. If you want to shop a specific Air Intakes brand, we stock 13 different brands like Felpro, Hitachi, and Dorman. 2003 Chevrolet Silverado 1500 Air Intakes start as low as $1.29!

One of the best ways to find top quality OEM or aftermarket Air Intakes is by asking professionals. Short of that, you can shop with confidence thanks to our 2,240 extensive product reviews on 2003 Chevrolet Silverado 1500 Air Intakes. Some of the top-rated Air Intakes products we carry are Engine Intake Manifold Gasket Set with 4.9 stars and INTAKE MANIFOLD GASKET SET with 4.5 stars.

Did we mention you can order your Air Intakes from our online catalog and have them shipped right to your garage? Or, if you feel like seeing the parts first-hand, search for your nearest Advance Auto Parts location above and pick up in-store when you’re ready. Browse our full Air Intakes inventory for your 2003 Chevrolet Silverado 1500 below to get started!

Top-Rated Air Intakes Brands For Your 2003 Chevrolet Silverado 1500

Trusted Air Intakes OEM and aftermarket product brands are what Advance Auto Parts specializes in. The brands we work with are sure to keep that 2003 Chevrolet Silverado 1500 running right for years to come. In our inventory you’ll find brands like Felpro, Hitachi, Dorman, and even more.

Popular ACDelco Air Intakes

You’ll find popular ACDelco brand products across Throttle Bodies & Carb Parts. All are waiting to get your 2003 Chevrolet Silverado 1500 back on the road. Some of the top-rated ACDelco products in these categories are:
Throttle Position Sensor
from $59.99
(6)
Throttle Position Sensor
Throttle Position Sensors

FAQs for 2003 Chevrolet Silverado 1500 Air Intakes

What are the most purchased Air Intakes for the 2003 Chevrolet Silverado 1500?

Out of 37 Air Intakes for the 2003 Chevrolet Silverado 1500, the most popular in our inventory are:
Electronic Throttle Body: New
from $251.99
(18)
Electronic Throttle Body: New
Throttle Bodies
Fuel Injection Throttle Body Mounting Gasket
from $8.79
(16)
Fuel Injection Throttle Body Mounting Gasket
Throttle Body Mounting Gaskets
Throttle Position Sensor
from $44.99
This product is not rated
Throttle Position Sensor
Throttle Position Sensors

What are the top-rated 2003 Chevrolet Silverado 1500 Air Intakes?

Top-rated Air Intakes for your 2003 Chevrolet Silverado 1500 based on customer reviews/ratings are:
Engine Intake Manifold Gasket Set
from $92.99
(36)
Engine Intake Manifold Gasket Set
“this will eliminate the need for future replacement of the intake gaskets (no more plastic to break out & cause leaks)”
INTAKE MANIFOLD GASKET SET
from $46.99
(32)
INTAKE MANIFOLD GASKET SET
“it,s just a gasket set”
Engine Intake Manifold Bolt Set
from $41.99
(22)
Engine Intake Manifold Bolt Set
“These are 5/16″ bolts, but have the ball-end to supposedly prevent over-tightening. They also have a washer-type surface and thread-locker applied. Th”