GMC C25 Exhaust Manifold and Headers

ARP manufactures a variety of premium grade bolt and stud kits to facilitate installation of exhaust headers including the popular stainless stud kit with 12 point nuts. The Stainless 300 material is not affected by corrosion or extreme heat, making it ideal for the application.

Product Features:

• Material Is Not Affected By Corrosion Or Extreme Heat
• The Compact 12 Point Nut Lets You Easily Slip A Socket Close To The Pipe
• Substantially Stronger Than Grade 8 Hardware
• Nominally Rated At 170,000 PSI Tensile Strength
• 3/8″-16 Thread Size
• 1″ Underhead Length

Vibe Lock Header Bolt Kit

Headlock Bolts eliminate the need for lock washers, Period. That’s because each Headlock Bolt features 24 equally-spaced, stainless steel teeth serrations that bite into and hold onto the attaching surface-eliminating the need for lock-washers.

Product Features:

• 16 per Package
• Includes a ball-head/hex-key socket-installation tool that makes it easy to get them started
• 410 stainless steel
• Minimum 180,000 PSI tensile strength
• 24 equally spaced clockwise teeth

Vibe-Lock Bolt

ARP manufactures a variety of premium grade bolt and stud kits to facilitate installation of exhaust headers including the popular stainless stud kit with 12 point nuts. The Stainless 300 material is not affected by corrosion or extreme heat, making it ideal for the application.

Product Features:

• Material Is Not Affected By Corrosion Or Extreme Heat
• The Compact 12 Point Nut Lets You Easily Slip A Socket Close To The Pipe
• Substantially Stronger Than Grade 8 Hardware
• Nominally Rated At 170,000 PSI Tensile Strength
• Set of 16
• 0.75″ Overall Length

Vibe-Lock Bolt

ARP manufactures a variety of premium grade bolt and stud kits to facilitate installation of exhaust headers including the popular stainless stud kit with 12 point nuts. The Stainless 300 material is not affected by corrosion or extreme heat, making it ideal for the application.

Product Features:

• Material Is Not Affected By Corrosion Or Extreme Heat
• The Compact 12 Point Nut Lets You Easily Slip A Socket Close To The Pipe
• Substantially Stronger Than Grade 8 Hardware
• Nominally Rated At 170,000 PSI Tensile Strength
• Set of 12
• 0.75″ Overall Length

ARP manufactures a variety of premium grade bolt and stud kits to facilitate installation of exhaust headers including the popular stainless stud kit with 12 point nuts. The Stainless 300 material is not affected by corrosion or extreme heat, making it ideal for the application.

Product Features:

• Material Is Not Affected By Corrosion Or Extreme Heat
• The Compact 12-Point Nut Lets You Easily Slip A Socket Close To The Pipe
• Substantially Stronger Than Grade 8 Hardware
• Nominally Rated At 170,000 Psi Tensile Strength
• Set of 12
• 0.75″ Overall Length

ARP manufactures a variety of premium grade bolt and stud kits to facilitate installation of exhaust headers including the popular stainless stud kit with 12 point nuts. The Stainless 300 material is not affected by corrosion or extreme heat, making it ideal for the application.

Product Features:

• Material Is Not Affected By Corrosion Or Extreme Heat
• The Compact 12-Point Nut Lets You Easily Slip A Socket Close To The Pipe
• Substantially Stronger Than Grade 8 Hardware
• Nominally Rated At 170,000 Psi Tensile Strength
• 3/8″-16 Thread Size
• 1″ Underhead Length

ARP manufactures a variety of premium grade bolt and stud kits to facilitate installation of exhaust headers including the popular stainless stud kit with 12 point nuts. The Stainless 300 material is not affected by corrosion or extreme heat, making it ideal for the application.

Product Features:

• Material Is Not Affected By Corrosion Or Extreme Heat
• The Compact 12 Point Nut Lets You Easily Slip A Socket Close To The Pipe
• Substantially Stronger Than Grade 8 Hardware
• Nominally Rated At 170,000 PSI Tensile Strength
• 0.75″ Underhead Length
• Set of 12

These Hooker BlackHeart cast iron exhaust manifolds for the popular GM LT motor has a 2.5-inch outlet and are designed to hug close to the engine block so they fit into a wide variety of replacement and engine-swap applications. Their contoured design guides the exhaust directly toward the exit port for improved flow and minimal turbulence. Cast iron construction means they will provide years of leak-free performance with less under hood noise than traditional headers and their shorty design means you can route exhaust tubing close to your frame/floor pan for maximum ground clearance. OE quality MLS flange gaskets and hardware are included to ensure excellent fitment and a leak-free installation and are available in plain as cast finish, black or silver ceramic coatings for reduced engine compartment temperatures, improved corrosion resistance and excellent styling.

Product Features:

• 2.5 inch outlet diameter offers improved flow for maximum performance from a cast iron exhaust manifold
• Tight tuck design provides universal fit for most popular chassis and a clean traditional muscle car appearance
• Intended for GM LT engine swap applications where durability, quiet operation, and leak-free sealing is desired
• Available in plain as-cast finish or with black or silver ceramic coatings for reduced engine compartment temps and improved corrosion resistance
• Nickel plated steel mating flanges, MLS mating flange gaskets, and mating flange hardware included
• Cast from Hi-Silicon-Moly Ductile Iron to provide durability and corrosion resistance

Hooker Blackheart now offers stainless steel versions of our popular cast iron lineup of LT swap exhaust manifolds based on the BHS516 and family. The new stainless steel manifolds offer a number of advantages over the cast iron version, including increased durability, reduced weight, and improved corrosion resistance. The shorty tight tuck design means you can route exhaust tubing close to your frame/floor pan for maximum ground clearance. These are available in both natural cast and polished depending on the look you’re going for and all hardware is included (gaskets, bolts, and flanges).

Product Features:

• 2.5-inch outlet diameter offers improved flow for maximum performance from a cast exhaust manifold
• Tight tuck design provides universal fit for most popular chassis and a clean traditional muscle car appearance
• Intended for GM LT engine swap applications where durability, quiet operation, and leak-free sealing is desired
• Polished finish for a standout appearance. Also available in natural cast finish.
• Nickel plated steel mating flanges, MLS mating flange gaskets, and mating flange hardware included
• Stainless Steel construction to provide unmatched durability and corrosion resistance

These Hooker BlackHeart cast iron exhaust manifolds for the popular GM LT motor has a 2.5-inch outlet and are designed to hug close to the engine block so they fit into a wide variety of replacement and engine-swap applications. Their contoured design guides the exhaust directly toward the exit port for improved flow and minimal turbulence. Cast iron construction means they will provide years of leak-free performance with less under hood noise than traditional headers and their shorty design means you can route exhaust tubing close to your frame/floor pan for maximum ground clearance. OE quality MLS flange gaskets and hardware are included to ensure excellent fitment and a leak-free installation and are available in plain as cast finish, black or silver ceramic coatings for reduced engine compartment temperatures, improved corrosion resistance and excellent styling.

Product Features:

• 2.5 inch outlet diameter offers improved flow for maximum performance from a cast iron exhaust manifold
• Tight tuck design provides universal fit for most popular chassis and a clean traditional muscle car appearance
• Intended for GM LT engine swap applications where durability, quiet operation, and leak-free sealing is desired
• Available in plain as-cast finish or with black or silver ceramic coatings for reduced engine compartment temps and improved corrosion resistance
• Nickel plated steel mating flanges, MLS mating flange gaskets, and mating flange hardware included
• Cast from Hi-Silicon-Moly Ductile Iron to provide durability and corrosion resistance

Hooker has long been known for its dominance of the drag racing circuit, but did you know that Hooker can help the off-road enthusiast scorch the deserts, mountains and swamps of the world Hooker Headers use long tube lengths and long transition collectors to produce monstrous low-mid range torque without sacrificing top end horsepower. Each Hooker header is designed to provide the finest fit and most durable construction available on the market today. Hooker offers a complete line of full length and emission compatible headers for the off-road enthusiast to choose from. Whether it be a rock crawling Jeep or a 1000 mile desert racer, Hooker can bring your performance expectations to a new level.

Product Features:

• Tuned-length primary tubes for maximum exhaust scavenging and velocity
• Mandrel-bent tubing for smooth exhaust flow
• Light weight & sturdy 18 gauge tubing
• Long transition collector for decreased back pressure
• 5/16″ machined flanges for a perfect seal
• Industry’s best welds for durability
• Designed for optimal performance
• All necessary hardware included for a complete installation

Hooker Competition headers offer the best value in the high performance header market. Designed for the value-conscious buyer, Hooker Competition headers offer premium features at a very competitive price. Made of durable 16 gauge mild steel tubing, the Hooker Competition header design utilizes a long transition collector to reduce back pressure and increase exhaust flow. A perfect sealing surface is assured with the 5/16″ machined flanges, with welded O-ring seals. Experience has proven that this flange size is ideal to maintain header integrity and be pliable enough to seal each exhaust port. Tubing is mandrel-bent to maintain metal strength and provide consistent tube diameter at radii to maximize performance. Hooker Competition headers have a standard finish that features a heat-cured, high-heat-resistant paint. Optionally, the famous Hooker Ceramic Thermal Barrier Coating is available.

Product Features:

• Tuned-length primary tubes for better performance
• Mandrel-bent tubing for smooth exhaust flow
• Light weight & sturdy 16 gauge tubing
• Long transition collector for decreased back pressure
• 5/16″ machined flanges for a perfect seal
• Industry’s best welds for durability
• Designed for easy, trouble-free fit
• All necessary hardware included for a complete installation
• Works with factory power steering, power brakes and air conditioning

Hooker Blackheart now offers stainless steel versions of our popular cast iron lineup of LT swap exhaust manifolds based on the BHS516 and family. The new stainless steel manifolds offer a number of advantages over the cast iron version, including increased durability, reduced weight, and improved corrosion resistance. The shorty tight tuck design means you can route exhaust tubing close to your frame/floor pan for maximum ground clearance. These are available in both natural cast and polished depending on the look you’re going for and all hardware is included (gaskets, bolts, and flanges).

Product Features:

• 2.5-inch outlet diameter offers improved flow for maximum performance from a cast exhaust manifold
• Tight tuck design provides universal fit for most popular chassis and a clean traditional muscle car appearance
• Intended for GM LT engine swap applications where durability, quiet operation, and leak-free sealing is desired
• Plain as-cast finish for a factory appearance. Also available in polished.
• Nickel plated steel mating flanges, MLS mating flange gaskets, and mating flange hardware included
• Stainless Steel construction to provide unmatched durability and corrosion resistance

They feature a merged collector coupled with a collector spear that is welded inside the collector. These components help to improve the flow and performance of the header.

Product Features:

• CNC Mandrel-bent tubes provide consistent tubing diameters for smooth flow and increases the cylinder scavenging effect and improves engine breathing
• Heavy duty 16-gauge 409SS tubing for increased strength and durability
• 1-5/8″ and 1-3/4″ tubing diameters available for increased exhaust flow increasing performance and improved throttle response
• 3″ collector for maximum strength and exhaust flow
• Extra thick header flange for a leak-free seal and maximum strength
• Welded-in collector merge spears to control exhaust gas re-entry into primary tubes

Flowtech Headers are the perfect combination of quality and value. These Small Block Chevy Upright headers available in 1-5/8″ and 1-3/4″ tube diameters are ideal for even big cubic inch Small Block Chevy engines. They feature a merged collector coupled with a collector spear that is welded inside the collector. These components help to improve the flow and performance of the header.

Product Features:

• CNC Mandrel-bent tubes provide consistent tubing diameters for smooth flow and increases the cylinder scavenging effect and improves engine breathing
• Heavy duty 16-gauge 409SS tubing for increased strength and durability
• 1-5/8″ and 1-3/4″ tubing diameters available for increased exhaust flow increasing performance and improved throttle response
• 3″ collector for maximum strength and exhaust flow
• Extra thick header flange for a leak-free seal and maximum strength
• Welded-in collector merge spears to control exhaust gas re-entry into primary tubes

Hooker Competition headers offer the best value in the high performance header market. Designed for the value-conscious buyer, Hooker Competition headers offer premium features at a very competitive price. Made of durable 16 gauge mild steel tubing, the Hooker Competition header design utilizes a long transition collector to reduce back pressure and increase exhaust flow. A perfect sealing surface is assured with the 5/16″ machined flanges, with welded O-ring seals. Experience has proven that this flange size is ideal to maintain header integrity and be pliable enough to seal each exhaust port. Tubing is mandrel-bent to maintain metal strength and provide consistent tube diameter at radii to maximize performance. Hooker Competition headers have a standard finish that features a heat-cured, high-heat-resistant paint. Optionally, the famous Hooker Ceramic Thermal Barrier Coating is available.

Product Features:

• Tuned-length primary tubes for better performance
• Mandrel-bent tubing for smooth exhaust flow
• Light weight & sturdy 16 gauge tubing
• Long transition collector for decreased back pressure
• 5/16″ machined flanges for a perfect seal
• Industry’s best welds for durability
• Designed for easy, trouble-free fit
• All necessary hardware included for a complete installation
• Works with factory power steering, power brakes and air conditioning

These Hooker BlackHeart cast iron exhaust manifolds for the popular GM LT motor has a 2.5-inch outlet and are designed to hug close to the engine block so they fit into a wide variety of replacement and engine-swap applications. Their contoured design guides the exhaust directly toward the exit port for improved flow and minimal turbulence. Cast iron construction means they will provide years of leak-free performance with less under hood noise than traditional headers and their shorty design means you can route exhaust tubing close to your frame/floor pan for maximum ground clearance. OE quality MLS flange gaskets and hardware are included to ensure excellent fitment and a leak-free installation and are available in plain as cast finish, black or silver ceramic coatings for reduced engine compartment temperatures, improved corrosion resistance and excellent styling.

Product Features:

• 2.5 inch outlet diameter offers improved flow for maximum performance from a cast iron exhaust manifold
• Tight tuck design provides universal fit for most popular chassis and a clean traditional muscle car appearance
• Intended for GM LT engine swap applications where durability, quiet operation, and leak-free sealing is desired
• Available in plain as-cast finish or with black or silver ceramic coatings for reduced engine compartment temps and improved corrosion resistance
• Nickel plated steel mating flanges, MLS mating flange gaskets, and mating flange hardware included
• Cast from Hi-Silicon-Moly Ductile Iron to provide durability and corrosion resistance

This exhaust manifold was precision-engineered and durably manufactured to match the fit and function of the original manifold on specified vehicles. It includes all necessary gaskets and downpipe hardware for a complete repair.

Product Features:

• Ideal replacement – this exhaust manifold was precision-engineered and durably manufactured to match the fit and function of the stock manifold on specified vehicles
• Reliable construction – durable materials resist warping, cracking and leaking for long-lasting performance
• Complete repair – includes all necessary gaskets and downpipe hardware
• Trustworthy design – built by industry leader in aftermarket manifolds

Universal SUPER COMPETITION headers are great for custom car, truck, or hot rod where a specific fit tuned SUPER COMPETITION header is not available. They work great for those tight-fit installations where frame rails are close to the engine block. These headers can not be used with factory side engine mounts. The collector exits parallel with the oil pan rail, maximum ground clearance is allowed. These headers come complete with gaskets, header bolts and collector reducers. These headers come available in chrome, high heat resistant black paint or Hookers Metallic Ceramic Thermal Barrier Coating.

Product Features:

• All necessary hardware included for a complete installation
• Designed for optimal performance
• Industry’s best welds for durability
• Machined flanges for a perfect seal
• Easy installation – can be used with stock motor mounts
• Tight-tuck design for narrow frame rails
• Light weight & sturdy 18 gauge tubing
• Mandrel-bent tubing for smooth exhaust flow
• Tuned-length primary tubes for maximum exhaust scavenging and velocity

Flowtech Headers are the perfect combination of quality and value. These Big Block Chevy Upright headers available in 2-1/4″ tube diameters are ideal for even big cubic inch Big Block Chevy engines

Product Features:

• CNC Mandrel-bent tubes provide consistent tubing diameters for smooth flow and increases the cylinder scavenging effect and improves engine breathing
• Heavy duty 16-gauge 409SS tubing for increased strength and durability
• 2-1/4″ tubing diameter for increased exhaust flow increasing performance and improved throttle response
• Extended 4″ collector for maximum strength and exhaust flow
• Extra thick 7/16″ header flange for a leak-free seal and maximum strength
• Welded-in collector merge spears to control exhaust gas re-entry into primary tubes
• Center of exhaust port to end of collector length is 33-1/2″

Flowtech Headers are the perfect combination of quality and value. These Big Block Chevy Upright headers available in 2-1/4″ tube diameters are ideal for even big cubic inch Big Block Chevy engines.

Product Features:

• CNC Mandrel-bent tubes provide consistent tubing diameters for smooth flow and increases the cylinder scavenging effect and improves engine breathing
• Heavy duty 16-gauge 409SS tubing for increased strength and durability
• 2-1/4″ tubing diameter for increased exhaust flow increasing performance and improved throttle response
• Extended 4″ collector for maximum strength and exhaust flow
• Extra thick 7/16″ header flange for a leak-free seal and maximum strength
• Welded-in collector merge spears to control exhaust gas re-entry into primary tubes
• Center of exhaust port to end of collector length is 33-1/2″

Does not fit with angel plug or raised port heads. Hooker Competition headers offer the best value in the high performance header market. Designed for the value-conscious buyer, Hooker Competition headers offer premium features at a very competitive price. Made of durable 16 gauge mild steel tubing, the Hooker Competition header design utilizes a long transition collector to reduce back pressure and increase exhaust flow. A perfect sealing surface is assured with the 5/16″ machined flanges, with welded O-ring seals. Experience has proven that this flange size is ideal to maintain header integrity and be pliable enough to seal each exhaust port. Tubing is mandrel-bent to maintain metal strength and provide consistent tube diameter at radii to maximize performance.

Product Features:

• Tuned-length primary tubes for better performance
• Mandrel-bent tubing for smooth exhaust flow
• Light weight & sturdy 16 gauge tubing
• Long transition collector for decreased back pressure
• 5/16″ machined flanges for a perfect seal
• Industry’s best welds for durability
• Designed for easy, trouble-free fit
• All necessary hardware included for a complete installation
• Works with factory power steering, power brakes and air conditioning