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    Doug Thorley Headers

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      It was the late 1950s, during the golden era of hot rods, when Doug Thorley crafted his plans for the highest quality headers on the block. Fine tuning, superior craftsmanship and unmatched attention to detail helped Doug Thorley Headers power street racers everywhere.

      Now 50 years later, Doug Thorley Headers are built with the same mission in mind: amping-up the power of your street ride. Thorley Headers use one of three souped-up designs: a unique Tri-Y setup that roars from idle up to 4500 RPM; shortie headers for ease of installation and smog compliance; and long tube headers that specialize in mid to high RPM power.

      Because they're setup for the streets, Thorley Headers also feature the hardware and custom flanging to be 50-state smog legal (some shortie applications). Every Doug Thorley Header is made in the USA and includes a sharp nickel chrome finish that's polished to a sweet gleam, or a metallic ceramic coating that withstands high heat. And, your Doug Thorley Headers carry a Lifetime Warranty for the original owner.

      Thanks to the Magnuson Moss Warranty Act: US Code – Title 15, Chapter 50, Sections 2301-2312, your vehicle’s factory warranty is protected by law when you add aftermarket parts.  Details

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      Doug Thorley Headers Customer Reviews

      Average Rating

      96 Customer Reviews

      Tacoma 2.7 improved

      Reviewed by MARCUS D (CORONA, CA) Reviewed for a 2013 Toyota Tacoma — May 09, 2017 10:08 PM

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      Header was well built. Great finish, very pretty. Install was a pain, but I figured it out. The egr housing hits the header flange, so I enlarged the mount holes with a drill bit and it shifted the egr just enough. Install took me 3 hours and I am an experienced mechanic. First test drive I noticed no difference. After a few fillups and the computer adjusted and get better pedal feel and little better fuel economy. Even with the hassle of the install, no regrets.

      DTH for wrangler

      Reviewed by William B (Odenton, MD) Reviewed for a 2002 Jeep Wrangler — Apr 24, 2017 8:53 AM

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      Awesome item, bolted right on, used factory bolts lined up perfect. Nice packaging to keep it frm getting damaged.

      Great performance gain

      Reviewed by steve g (HIGHLAND, IN) Reviewed for a 2008 Pontiac Grand Prix — Mar 08, 2017 8:21 PM

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      Great gain in performance, but did add a little more noise from exhaust.

      Install

      Reviewed by Stephen A (San Jose, CA) Reviewed for a 1988 Toyota Pickup — Feb 21, 2017 2:37 AM

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      Installation went like every set of headers that I have installed in my automotive life. By that I mean that exhaust pipe bending and replacement was required. As I am 68 years old, it is unlikely that I will ever install another set of headers in my life. I have never installed a set that did NOT require major work by the muffler shop to complete the installation. However, they addressed the performance problem I was seeking to correct. The unexpected benefit was a quieter exhaust.

      I love these headers!

      Reviewed by Larry E (Riverside, CA) Reviewed for a 1997 Toyota Tacoma — Sep 22, 2016 9:36 PM

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      This was one of the first big mods i did to my 97 tacoma and i am so happy with the result. i added a gibson cat back and the truck sounds like a beast.