Doug Thorley Headers Parts and Accessories

The same way Summit Racing offers more than just racing parts, Doug Thorley Headers makes much more than just headers. Doug Thorley manufactures a full line of exhaust...

The same way Summit Racing offers more than just racing parts, Doug Thorley Headers makes much more than just headers. Doug Thorley manufactures a full line of exhaust products, including complete exhaust systems, free-flowing Y-pipes, tailpipes, and much more. And yes, you’ll find legendary Thorley headers, too. We’ve got full-length, tri-Y, block hugger, and shorty headers to meet your torque and power needs. Unleash the beast under your hood—shop Doug Thorley Headers exhaust parts at Summit Racing today!

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Doug Thorley Headers

Backed by 40-plus years of knowledge and experience, Thorley headers are designed to outflow your stock exhaust manifolds. These headers increase gas mileage and give your engine more horsepower across the entire rpm range. Their design configuration builds the most power across the rpm range, which is great for everything from street/strip performance, to towing, to steep grades. To make these headers last, Thorley made them out of durable 14-gauge mild steel with 3/8 in. thick flanges and 5/16 in. collector rings or 13 gauge stainless steel with ½ in. thick flanges and topped them off with a good looking, nickel chrome plated finish or a high temperature ceramic coating. To prevent leaks, these headers have an O-ring welded into the flange, in addition to the high-temperature gasket provided. Unless otherwise noted, these headers are designed to fit the vehicle as it came from the manufacturer. This includes components like cylinder heads, chassis, steering, motor mounts, body mounts and bushings, etc. If your vehicle is using aftermarket components, parts from other applications, or custom altered parts, then it is the installer's responsibility to verify fitment.

4.33 out of 5 stars ( 43 )

$836.00

$468.00

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$1,195.00

Doug Thorley Headers Exhaust Flange Gaskets

Doug Thorley exhaust flange gaskets replace your worn seals with their high-quality graphite and steel models. These exhaust header gaskets feature much better sealing capabilities and longevity over lower-quality alternatives. Order the size needed for your tube diameter.

5.0 out of 5 stars ( 3 )

$34.45

Doug Thorley Headers Collector Gaskets

Doug Thorley headers collector gaskets are the only ones designed exclusively for use with Doug Thorley headers. Manufactured for a precision fit from high-quality materials, these gaskets will keep your exhaust leak-free.

4.8 out of 5 stars ( 5 )

$4.76

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$37.63

Doug Thorley Exhaust Header Gaskets

Doug Thorley header gaskets are custom-made from a high-temperature material that withstands heat up to 1,200 degrees F. It is imperative that you use a gasket for a guaranteed seal every time, and these are some of the toughest out there. In addition to flat gaskets, they also offer a line of conical (donut-style) gaskets made from a graphite composite. Conical gaskets are specifically designed for movement and flexibility. Simply put, Doug Thorley gaskets do not leak.

4.2 out of 5 stars ( 5 )

$4.76

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$38.07

Doug Thorley Tri-Y Headers

Thorley headers are designed to outflow your stock exhaust manifolds. They are designed with an emphasis on maximum low and mid range torque, while making ample horsepower throughout the RPM range. The Tri-Y 4:2:1 configuration builds the most power in the middle rpm range, which is great for towing and steep grades. To make these headers last, Thorley made them out of durable 14-gauge mild steel with 3/8 in. thick flanges and 5/16 in. collector rings. To prevent leaks, these headers have an O-ring welded into the flange, in addition to the high-temperature gasket provided. Unless otherwise noted, these headers are designed to fit the vehicle as it came from the manufacturer. This includes components like cylinder heads, chassis, steering, motor mounts, body mounts and bushings, etc. If your vehicle is using aftermarket components, parts from other applications, or custom altered parts, then it is the installer's responsibility to verify fitment.

4.33 out of 5 stars ( 3 )

$985.00

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$1,814.00

Doug Thorley Exhaust Systems

Doug Thorley exhaust systems are the best choice to wake up the performance and looks of your vehicle, while providing the most for your dollar. They are built to free up horsepower, add a sportier tone, and add the appeal of long-lasting stainless steel and beautiful chrome to your ride. Precise CNC mandrel bends, heavy-duty 16-gauge tubing, and high performance mufflers create impressive bolt-on power. Get the biggest bang for your buck with Doug Thorley exhaust systems.

Not Yet Reviewed

$836.00

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