2021 Subaru WRX STI Car Parts & Accessories

You have come to the right place if you need new or replacement parts for your 2021 WRX STI. Advance Auto carries over 456 aftermarket parts for your 2021 Subaru WRX STI, along with original equipment manufacturer (OEM) parts. You will find amazing prices on 2021 WRX STI Body Parts and Transmission Parts. Plus, our selection of 2021 Appearance and Paint Products for your WRX STI are some of the lowest in the market.

Find replacement parts and upgrades for your 2021 Subaru WRX STI. Use our customer reviews of Clutch Systems parts and others, along with user ratings on the many of the products we offer. You won’t find an easier way to shop for 2021 Subaru WRX STI performance parts, 2021 Subaru WRX STI body parts, interior components, or any type of part for that matter. Get your WRX STI upgraded or back in pristine shape by shopping Advance Auto Parts.

2021 WRX STI Body Parts

Customers frequently purchase these best-selling 2021 Subaru WRX STI Body Parts.

Burco – Side View Replacement Mirror (Part No.4555)

Side View Replacement Mirror

from

$39.99
Burco Redi Cuts mirror replacements provide a solution when just the mirror glass is broken. Our mirror replacements are an economical and quality alternative to high-priced OEM mirror assemblies. Burco offers an industry leading 4,700+ Redi Cuts mirror replacements covering 10,000 vehicles and counting. b+savvy and replace that broken side mirror!

Product Features:
  • Made in USA
  • Exact Fit
  • Safety Smooth Edges
  • Replaces OE Mirror
  • Premium Mirror Glass
  • Break-Free Guarantee
  • Instructions Included
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Burco – Heated Side View Mirror Replacement (Part No.5596H)

Heated Side View Mirror Replacement

from

$64.99
Burco Redi Cuts mirror replacements provide a solution when just the mirror glass is broken. Our mirror replacements are an economical and quality alternative to high-priced OEM mirror assemblies. Burco offers an industry leading 4,700+ Redi Cuts mirror replacements covering 10,000 vehicles and counting. b+savvy and replace that broken side mirror!

Product Features:
  • Made in USA
  • Exact Fit
  • Safety Smooth Edges
  • Replaces OE Mirror
  • Premium Mirror Glass
  • Break-Free Guarantee
  • Instructions Included
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K-Source – Mirror Assembly: Passenger Side, Power Adjustment, Heated, Foldable, 1 Pk (Part No.71009U)

Mirror Assembly: Passenger Side, Power Adjustment, Heated, Foldable, 1 Pk

from

$155.99
Original Equipment Manufacturer Style Replacement Side View Mirror. K Source is a unique manufacturer in that we specialize in making only automotive and motorcycle mirrors. Our experience in this category for over 71 years is exactly what our customers have come to trust and rely upon, as our manufacturing and marketing expertise has consistently led the market in replacement products.

Product Features:
  • Passenger side Mirror, tested to fit and function like the original, Meets or exceeds Original Equipment Manufacturer standards
  • Mirror glass is power adjustable and heated
  • OE-comparable wiring harness/ connection (no “pigtail” connector) for hassle-free installation
  • Manual folding for additional clearance
  • Textured Black with Paintable to match cover
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Burco – Blind Spot Mirror Replacement (Part No.5635B)

Blind Spot Mirror Replacement

from

$74.99
Burco Redi Cuts mirror replacements provide a solution when just the mirror glass is broken. Our mirror replacements are an economical and quality alternative to high-priced OEM mirror assemblies. Burco offers an industry leading 4,700+ Redi Cuts mirror replacements covering 10,000 vehicles and counting. b+savvy and replace that broken side mirror!

Product Features:
  • Made in USA
  • Exact Fit
  • Safety Smooth Edges
  • Replaces OE Mirror
  • Premium Mirror Glass
  • Break-Free Guarantee
  • Instructions Included
See More

K-Source – Mirror Assembly: Passenger Side, Power Adjustment, Heated, Foldable, 1 Pk (Part No.71011U)

Mirror Assembly: Passenger Side, Power Adjustment, Heated, Foldable, 1 Pk

from

$187.99
Original Equipment Manufacturer Style Replacement Side View Mirror. K Source is a unique manufacturer in that we specialize in making only automotive and motorcycle mirrors. Our experience in this category for over 71 years is exactly what our customers have come to trust and rely upon, as our manufacturing and marketing expertise has consistently led the market in replacement products.

Product Features:
  • Passenger side Mirror, tested to fit and function like the original, Meets or exceeds Original Equipment Manufacturer standards
  • Mirror glass is power adjustable and heated, with turn signal
  • OE-comparable wiring harness/ connection (no “pigtail” connector) for hassle-free installation
  • Manual folding for additional clearance
  • Textured Black with Paintable to match cover
  • Turn Signal
See More

Burco – Heated Side View Mirror Replacement (Part No.4555H)

Heated Side View Mirror Replacement

from

$64.99
Burco Redi Cuts mirror replacements provide a solution when just the mirror glass is broken. Our mirror replacements are an economical and quality alternative to high-priced OEM mirror assemblies. Burco offers an industry leading 4,700+ Redi Cuts mirror replacements covering 10,000 vehicles and counting. b+savvy and replace that broken side mirror!

Product Features:
  • Made in USA
  • Exact Fit
  • Safety Smooth Edges
  • Replaces OE Mirror
  • Premium Mirror Glass
  • Break-Free Guarantee
  • Instructions Included
See More

Burco – Blind Spot Mirror Replacement (Part No.4601B)

Blind Spot Mirror Replacement

from

$64.99
Burco Redi Cuts mirror replacements provide a solution when just the mirror glass is broken. Our mirror replacements are an economical and quality alternative to high-priced OEM mirror assemblies. Burco offers an industry leading 4,700+ Redi Cuts mirror replacements covering 10,000 vehicles and counting. b+savvy and replace that broken side mirror!

Product Features:
  • Made in USA
  • Exact Fit
  • Safety Smooth Edges
  • Replaces OE Mirror
  • Premium Mirror Glass
  • Break-Free Guarantee
  • Instructions Included
See More

Burco – Side View Replacement Mirror (Part No.5596)

Side View Replacement Mirror

from

$39.99
Burco Redi Cuts mirror replacements provide a solution when just the mirror glass is broken. Our mirror replacements are an economical and quality alternative to high-priced OEM mirror assemblies. Burco offers an industry leading 4,700+ Redi Cuts mirror replacements covering 10,000 vehicles and counting. b+savvy and replace that broken side mirror!

Product Features:
  • Made in USA
  • Exact Fit
  • Safety Smooth Edges
  • Replaces OE Mirror
  • Premium Mirror Glass
  • Break-Free Guarantee
  • Instructions Included
See More

Dorman – Push-Type Fender – Bumper And Grille Retainer – 10 mm Hole (Part No.963-126D)

Push-Type Fender - Bumper And Grille Retainer - 10 mm 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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2021 WRX STI Transmission Parts

No need for it to be difficult to find Transmission Parts for your 2021 Subaru WRX STI. Compare prices, read reviews, and buy your WRX STI Transmission Parts online for delivery or in-store pick up.

Anchor – Torque Strut Motor Mount: Rear, 1 Piece (Part No.9559)

Torque Strut Motor Mount: Rear, 1 Piece

from

$29.99
The purpose of the mount is to support the engine and transmission on the chassis and dampen vibration and noise from reverberating to the rest of the vehicle. The Torque Strut prevents engine rocking. Each part is engineered and manufactured to meet or exceed OEM specifications using the latest CAD/CAM engineering process to ensure superior quality, form, fit and function. Only premium quality materials are used in the manufacturing process to guarantee precise performance and maximum durability. Applicable to SAAB 05-06; SUBA 99-22;. Please verify your application.

Product Features:
  • MAXIMUM LIFE & PERFORMANCE: Both natural and SBR (Styrene Butadiene) rubber provide good abrasion resistance and aging stability to ensure maximum life and performance.
  • MEETS OR EXCEEDS DUROMETER MEASUREMENTS: All rubber material is manufactured to specific Durometer (hardness) measurements based on the vehicle’s application requirements.
  • HARDENED STEEL FASTENERS: All fasteners are made of hardened steel with heat treated Grade #5 bolts.
  • SUPERIOR BOND: A special Chemlock® bonding agent is used to ensure a superior rubber-to-metal bond.
  • HYDRAULIC MOUNT DESIGN: Hydraulic Mounts (applicable where OE) are designed for most front wheel drive vehicles because transverse drive train mounting.
  • For Years: 1999-2022
  • Weight approx: 1 Lbs
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Anchor – Transmission Mount: Rear, 1 Piece (Part No.9566)

Transmission Mount: Rear, 1 Piece

from

$81.99
The purpose of the mount is to support the engine and transmission on the chassis and dampen vibration and noise from reverberating to the rest of the vehicle. Engine and Transmission Mounts are engineered and manufactured to meet or exceed OEM specifications using the latest CAD/CAM engineering process to ensure superior quality, form, fit and function. Only premium quality materials are used in the manufacturing process to guarantee precise performance and maximum durability. Applicable to SUBA 04-19;. Please verify your application.

Product Features:
  • MAXIMUM LIFE & PERFORMANCE: Both natural and SBR (Styrene Butadiene) rubber provide good abrasion resistance and aging stability to ensure maximum life and performance.
  • MEETS OR EXCEEDS DUROMETER MEASUREMENTS: All rubber material is manufactured to specific Durometer (hardness) measurements based on the vehicle’s application requirements.
  • HARDENED STEEL FASTENERS: All fasteners are made of hardened steel with heat treated Grade #5 bolts.
  • SUPERIOR BOND: A special Chemlock® bonding agent is used to ensure a superior rubber-to-metal bond.
  • HYDRAULIC MOUNT DESIGN: Hydraulic Mounts (applicable where OE) are designed for most front wheel drive vehicles because transverse drive train mounting.
  • For Years: 2004-2019
  • Weight approx: 3 Lbs
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Whiteline – Gearbox Crossmember Pad Bushing (Part No.KDT901)

Gearbox Crossmember Pad Bushing

from

$69.99
Replace worn suspension bushings to as new condition and appearance with Whiteline black synthetic elastomer bushings.

Product Features:
  • Install guide included providing detailed instructions on how to install your new Whiteline purchase.
  • Internal grease reservoirs provide continual self lubrication for optimum friction management.
  • Specially bonded design for optimised strength typically required in high load bearing applications.
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Nippon Reinz – Oil Drain Plug Gaske (Part No.A612028860NRZ)

Oil Drain Plug Gaske

from

$1.92
Oil Drain Plug Gaske

2021 WRX STI Clutch Systems

Customers frequently purchased the following top Clutch Systems for their 2021 WRX STI. Click on “View All” to see more great prices on 2021 WRX STI aftermarket replacement Clutch Systems.

LuK – Clutch Kit: 9 7/16" Disc Diameter, 1" Input Shaft Diameter, 24 Tooth Spline (Part No.15-023)

Clutch Kit: 9 7/16" Disc Diameter, 1" Input Shaft Diameter, 24 Tooth Spline

from

$894.99
LuK: The brand professionals trust! For over thirty years, automotive aftermarket technicians have staked their reputation – and their customers’ satisfaction – on LuK RepSet(R) clutch components. Each set contains everything you need to get the job done right: new clutch, disc, release bearing, pilot bearing (where required), spline tool and lubricant. As an original-equipment supplier, LuK develops the performance specifications for individual vehicle applications. LuK offers the highest in-house manufactured content of any supplier in the industry.

Product Features:
  • Application matched for OE form, fit, and function
  • Manufactured with high-quality materials, using cutting edge technology and processes
  • Stock photo – Actual parts and materials may vary.
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Exedy – Clutch Release Bearing (Part No.I2020169744DKN)

Clutch Release Bearing

from

$85.30
The Exedy release bearing (also known as a throw-out bearing) is original equipment quality and maintains the equivalent fit and performance as the OE part it replaces. Exedy Clutch release bearings offer the conventional alignment function in a lightweight, compact body.

Product Features:
  • Extended service life
  • Compact, lightweight design
  • Sealed for life with high performance, application-specific grease
  • Integrated functionality
  • Design for high temperature, and high rotating speed
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LuK – Clutch Slave Cylinder (Part No.LSC602)

Clutch Slave Cylinder

from

$72.99
Schaeffler has played a crucial role in the development from mechanical to hydraulic clutch release systems. Over many years, Schaeffler has gained extensive expertise in the complete clutch release systems.
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Nachi – Pilot Bearing (Part No.I1010132692NAC)

Pilot Bearing

from

$6.93
The Nachi pilot bearing is manufactured in accordance to strict OEM specifications for performance and durability.

Product Features:
  • OEM supplier of clutch pilot bearings for Acura and Honda
  • Adopted original seal design to prevent contamination and grease leakage
  • Contains special grease for wider temperature ranges and longer life
  • Smooth and quiet operation
  • Lower rotating torque by improving seal lips
  • Compact design for lightweight to achieve high performance
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2021 WRX STI Automotive Accessories

AutoCraft – Car Cover, Grey, Fits Sedans Up to 15′, Breathable, Non-Abrasive, Dustproof (Part No.AC212)

Car Cover, Grey, Fits Sedans Up to 15', Breathable, Non-Abrasive, Dustproof

from

$42.99
Autocraft Easy Fit Car Cover offers superior protection against dirt, dust, rain and snow. Protects against acid rain, pollution and color fading UV rays. Durable, reinforced seams and elastic hems. Convenient storage bag included.

Product Features:
  • Lightweight, breathable, non-abrasive fabric
  • Water repellent, protects against mold and mildew
  • Full elastic hem with reinforced grommets
  • Full elastic and double stitched hem to ensure a better fit
  • 2 built-in reinforced grommets and 1 rope are included to keep your cover in place
  • Antenna hole patch included to to provide additional protection from water or dust soak into the hole that you cut for antenna.
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AutoCraft – Car Cover, Blue 3 Layers, Fits Sedans Up to 15′, Medium-Duty, Water Resistant, Outdoor Use (Part No.AC60)

Car Cover, Blue 3 Layers, Fits Sedans Up to 15', Medium-Duty, Water Resistant, Outdoor Use

from

$69.99
Autocraft Easy Fit Car Cover offers superior protection against dirt, dust, rain and snow. Protects against acid rain, pollution and color fading UV rays. Durable, reinforced seams and elastic hems. Convenient storage bag included.

Product Features:
  • Medium weight, breathable, non-abrasive fabric
  • Water repellent, protects against mold and mildew
  • Full elastic hem with reinforced grommets
  • Full elastic and ultrasonic sewn hem to ensure a better fit and extreme durability
  • 2 built-in reinforced grommets and 1 rope are included to keep your cover in place
  • Antenna hole patch included to to provide additional protection from water or dust soak into the hole that you cut for antenna.
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WeatherTech – Molded Fit, Black, Thermoplastic Polyolefin (Tpo), 2 Piece (Part No.444391)

Molded Fit, Black, Thermoplastic Polyolefin (Tpo), 2 Piece

from

$139.99
In the quest for the most advanced concept in floor protection, the talented designers and engineers at WeatherTech have worked tirelessly to develop the most advanced floor protection available today. The WeatherTech FloorLiner accurately and completely lines the interior carpet giving absolute interior protection. The WeatherTech FloorLiner lines the interior carpet up the front, back and even up the sides of the vehicle footwell. Digital laser measurements of interior surfaces offer a consistently perfect fit. A patent pending High-Density Tri-Extruded (HDTE) material allows for a rigid core for strength while offering surface friction to the carpet, as well as tactile feel to the surface Advanced surfacing creates channels that carry fluids and debris to a lower reservoir with further channeling to help minimize fluid movement while driving Once fluids become trapped in the reservoir, away from shoes and clothing, they are easily removed from the WeatherTech FloorLiner over the door sill. No muss-no fuss.

Product Features:
  • Accurately And Completely Lines The Interior Carpet Giving Absolute Interior Protection
  • Lines The Interior Carpet Up The Front, Back And Even Up The Sides Of The Vehicle Footwell
  • Digital Laser Measurements Of Interior Surfaces Offer A Consistently Perfect Fit
  • A Patent Pending High Density Tri Extruded (HDTE) Material Allows For A Rigid Core For Strength While Offering Surface Friction To The Carpet, As Well As Tactile Feel To The Surface
  • Advanced Surfacing Creates Channels That Carry Fluids And Debris To A Lower Reservoir With Further Channeling To Help Minimize Fluid Movement While Driving
  • Manufactured From A Proprietary Custom Blended TPO (Thermopolyolefin) That Is Not Only Wear Resistant, But Also Remains Flexible Under Extreme Temperatures
  • Available in fronts, rears, center hump, 3rd and 4th row, and complete sets
  • Available in black, tan, grey and cocoa
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Rightline Gear – Sport Jr. Car Top Carrier (Part No.100S50)

Sport Jr. Car Top Carrier

from

$109.99
The Rightline Gear Sport Jr Car Top Carrier is 100% waterproof and attaches to vehicles WITH or WITHOUT a roof rack. Attach the carrier’s straps to a vehicle’s roof rack or use the Car Clips to attach the straps to a vehicle’s door frame weather molding. The carrier is made from UV protected PVC Semi-Coated Mesh XT for maximum durability. The intuitive attachment method and simplified design of the Sport Carriers make carrying extra cargo easy. The Sport Jr is the only car top bag made specifically for compact cars.

Product Features:
  • Capacity: 10 cu ft
  • Dimensions: 36″ L x 30″ W x 16″ H
  • Designed for compact cars (can be used on larger vehicles), WITH or WITHOUT a roof rack
  • 100% waterproof with welded seams and SZIP waterproof zipper; no zipper flap required
  • Includes: carrier, (4) attachment straps, (4) car clips, and stuff sack with sewn-in set up guide
  • Includes: carrier, (4) attachment straps, (4) car clips, and stuff sack with sewn-in set up guide
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Rightline Gear – Car Top Duffle Bag (Part No.100D90)

Car Top Duffle Bag

from

$99.99
The Rightline Gear Car Top Duffle Bag is a 100% waterproof gear bag that you can pack, strap to the roof of your vehicle, transport, and then carry wherever you need to go. Attach (1) to (4) Duffle Bags to vehicles WITH or WITHOUT a roof rack. Each bag comes with a removable shoulder strap that can be stored in the bag’s zippered side pocket when not in use. The bag is made from tough PVC Coated Mesh that is re-enforced for strength and UV protected. The Car Top Duffle Bag defines travelling efficiency!

Product Features:
  • Capacity: 4.3 cu ft
  • Dimensions: 36″ L x 16″ W x 13″ H
  • 100% Waterproof with welded seams, urethane coated zippers, and a hook-&-loop-close zipper cover
  • Designed to be used on any size vehicle, WITH or WITHOUT a roof rack
  • Includes: bag, shoulder strap, (2) attachment straps, (4) Car Clips, and set up guide
  • Includes: duffle bag, (2) nylon straps, (4) Car Clips, and complete set up guide
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Rightline Gear – Range Jr Car Top Carrier (Part No.100R50)

Range Jr Car Top Carrier

from

$89.99
The Range Jr Car Top Carrier is weatherproof + and attaches to vehicles WITH or WITHOUT a roof rack. Attach the carrier’s straps to a vehicle’s roof rack or use the Car Clips to attach the straps to a vehicle’s door frame weather molding. The carrier is made from UV protected PVC Semi-Coated Mesh XT for maximum durability. Use the Range Carrier on your next family vacation, backwoods expedition, shopping spree, or move.

Product Features:
  • Dimensions: 36″ L x 32″ W x 15″ H
  • Designed for compact cars (can be used on larger vehicles), WITH or WITHOUT a roof rack
  • Weatherproof + with welded seams and a urethane coated zipper
  • Includes: carrier, (4) attachment straps, (4) car clips, and stuff sack with sewn-in set up guide
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Covercraft – UVS100 Custom Sunscreen – Blue Metallic (Part No.UV11430BL)

UVS100 Custom Sunscreen - Blue Metallic

from

$117.99
The UVS100 Sunscreen is an affordable way to protect the interior of your vehicle from damaging UV rays as well as adding a level of comfort and protection by reducing the interior temperature of the vehicle on hot days. The sunscreen is custom-fitted so that there is maximum coverage of the windshield area and ease of installation. Sometimes called heat shields, sun shields or UV shields, sunscreens are useful at the beach, work, airport or anywhere you park. This premium quality, custom patterned folding sunscreen also features a soft felt lining on the inside to help protect your interior.

Product Features:
  • Custom fit to the windshield for complete coverage
  • Protect the dash and other interior components from damage by the sun
  • Reduce the interior temperature of the vehicle on hot days
  • The foam core center of the shield acts as an insulator
  • Easy to use and store away when not in use
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Covercraft – UVS100 Custom Sunscreen – Blue Metallic (Part No.UV11251BL)

UVS100 Custom Sunscreen - Blue Metallic

from

$81.99
The UVS100 Sunscreen is an affordable way to protect the interior of your vehicle from damaging UV rays as well as adding a level of comfort and protection by reducing the interior temperature of the vehicle on hot days. The sunscreen is custom-fitted so that there is maximum coverage of the windshield area and ease of installation. Sometimes called heat shields, sun shields or UV shields, sunscreens are useful at the beach, work, airport or anywhere you park. This premium quality, custom patterned folding sunscreen also features a soft felt lining on the inside to help protect your interior.

Product Features:
  • Custom fit to the windshield for complete coverage
  • Protect the dash and other interior components from damage by the sun
  • Reduce the interior temperature of the vehicle on hot days
  • The foam core center of the shield acts as an insulator
  • Easy to use and store away when not in use
See More

Covercraft – UVS100 Custom Sunscreen – Silver (Part No.UV11430SV)

UVS100 Custom Sunscreen - Silver

from

$81.99
The UVS100 Sunscreen is an affordable way to protect the interior of your vehicle from damaging UV rays as well as adding a level of comfort and protection by reducing the interior temperature of the vehicle on hot days. The sunscreen is custom-fitted so that there is maximum coverage of the windshield area and ease of installation. Sometimes called heat shields, sun shields or UV shields, sunscreens are useful at the beach, work, airport or anywhere you park. This premium quality, custom patterned folding sunscreen also features a soft felt lining on the inside to help protect your interior.

Product Features:
  • Custom fit to the windshield for complete coverage
  • Protect the dash and other interior components from damage by the sun
  • Reduce the interior temperature of the vehicle on hot days
  • The foam core center of the shield acts as an insulator
  • Easy to use and store away when not in use
See More