Doug Thorley Headers

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Features

  • Doug Thorley Headers have been the cream of the performance exhaust crop since 1958
  • Custom-made for your vehicle from durable 14-gauge steel tubing for longevity and a precise fit
  • Doug Thorley Headers are available for your vehicle in one of three header styles:
  • Tri-Y Headers: Doug Thorley Tri-Y Headers feature unique engineering that properly matches your firing sequence, freeing your engine from the strain of pushing exhaust gasses. Provides power from idle through 4500 RPM
  • Shortie Headers: The easiest Doug Thorley Headers to install, these custom models are made short to fit limited space vehicles. Special care is taken to preserve emissions mounting positions for smog legality
  • Long Pipe Headers: For power in the mid to high RPM ranges, Doug Thorley Long Pipe Headers are tuned to deliver. They're the ideal pick for high-horsepower street vehicles
  • Doug Thorley Headers utilize a polished nickel chrome finish or a heavy-duty metallic ceramic coating that reduces under hood temperatures
  • Because Doug Thorley Headers are made to stringent 50 state smog law standards, all headers are available with the necessary smog equipment and mounting spots
  • Doug Thorley Headers include a model-specific gasket for a leak-free fit
  • Each model includes all necessary O2 sensor bosses for factory sensors
  • Your Doug Thorley Headers carry a Lifetime Warranty for the original owner

Description

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. Each header 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.

Doug Thorley Headers Customer Reviews

Average Customer Rating

   (47)
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Sweet Headers

Posted on 10/15/2009 by Randy B. - 2003 Ford F-250 (Bakersfield,CA)

Appearance
Ease of Installation
Price/Value
Quality

"These are a very nice set of headers, I removed a set of headers I purchased off of Ebay for my Ford V10 and I installed the Thorley headers I gained 5mph on a 7% grade. I love the sound and the horse power gain. I recomend them to any one."

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About Randy B.
Vehicle
2003 Ford F-250
I use my vehicle for
commute to work and vacations with my toy hauler
 
DOUG THOURLEY HEADERS

Posted on 10/01/2009 by Rollie N. (Edinburg,TX)

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Ease of Installation
Price/Value
Quality

"I RECENTLY RECEIVED MY D/T HEADERS AND I HAVE YET TO EXPERIENCE SOME HORSEPOWER BUT I KNOW IT CHANGED MY SOUND A LITTLE DEEP AND SAVED SOME GAS EVEN THOUH I GOT A HEAVY FOOT IF AT ANY TIME MY LITTLE EXTRA HORSEPOWER KICKS IN IT WOULD HAVE BEEN A GREAT INVESTMENT."

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About Rollie N.
 
Pretty good

Posted on 09/23/2009 by John P. - 2010 Chevy Camaro (Staten Island,NY)

0 of 2 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"good design, straight foward install, just wish they came with a CARB EO number welded on the headers. They really shouldnt say 50 state legal, if it doesnt come with one of those."

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About John P.
Vehicle
2010 Chevy Camaro
I use my vehicle for
shows and daily driving
 
They'rrrrrre Great!

Posted on 09/14/2009 by Jeremy H. - 2010 Chevy Camaro (Bountiful,UT)

1 of 1 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"Easy to install, noticed a difference in performance, not much difference in sound (with everything else complete stock). Would buy again!"

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About Jeremy H.
Vehicle
2010 Chevy Camaro
 
G8 Doug Thorley Review

Posted on 06/17/2009 by Zachary W. - 2008 Pontiac G8 (Herndon,VA)

7 of 7 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"Very nice headers, especially for the price! AutoAnything has fast shipping. Doug Thorley are comparable to more expensive headers from ARH and Kooks. Excellent mid range torque gains. Gained 30whp/wtq on the dyno, my car dynoed higher then cars with Kooks and similar mods. You will need to dyno tune your vehicle to the headers to take full advantage of the power they can produce. A hand held tuner or canned tune won't cut it."

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About Zachary W.
Vehicle
2008 Pontiac G8
 
Doug Thorley Header Review

Posted on 06/01/2009 by Tim D. - 2001 Toyota 4-Runner (Redmond,OR)

1 of 1 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"Adding the Doug Thorley headers to my 2001 4Runner made is sound a lot better, however the power gains are not terribly noticable. I can feel the gains in the high RPM ranges (over 4k), however from a stop or at low RPMs the headers appear to have reduced back pressure too much and the truck seems to choke a little off the line. Overall for the price I would recommend them if you have money to spend and are willing to add more than just the headers to make the truck faster."

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About Tim D.
Vehicle
2001 Toyota 4-Runner
I use my vehicle for
Everything
 
Amazing Header

Posted on 03/25/2009 by Jeffrey K. - 2006 Toyota Tacoma (Torrington,CT)

3 of 4 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"I put this header in my 2006 2.7 tacoma. It definately adds to high end torque and horsepower. I could feel the difference within 5 seconds of driving it. A header definately worth buying for the price."

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About Jeffrey K.
Vehicle
2006 Toyota Tacoma
 
FJ cruiser.

Posted on 03/05/2009 by Lane M. - 2008 Toyota FJ Cruiser (Beeville,TX)

4 of 7 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"Price was right. Took a while to ship. Once I got them I went down to a local shop. Three hrs it was done. I have a cat-back exhaust and the volume of the exhaust didnt increase, it just changed. got a more throaty sound. Power isnt increased by as much as i hoped. need to get the Y-pipe to complete the true free-flowing exhaust."

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About Lane M.
Vehicle
2008 Toyota FJ Cruiser
I use my vehicle for
everything
 
22r Doug Thorley Tri-Y Header

Posted on 11/24/2008 by David G. (Carrollton,TX)

15 of 16 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"The appearance and quality were good. The header tube material is thick - the header is heavy compared to most. The bolt up plate (where it bolts to the head) is solid and made thick to reduce warpage. The chrome was decent, the welds looked nice, and the bend and flow of the tubes (design) was very good. It was visually pleasing to a "gear head" Customer service was very good when I called Doug Thorley to ask a question about model application before I purchased. I would not recommend installation by a beginner. On the first installation the header, it leaked badly. The product had interference with the block, a support plate, and a support plate bolt. This caused the header to not tighten up on the gasket evenly. After grinding clearance on the block, on second installation, the header leaked badly again. This header works on different year models and on my model I had to remove two studs and replace with one stud. I did not know that these two studs sealed an exhaust passage. I had to custom make "plug" to fill the hole that was left by removing these studs. The third installation a small leak was detected at the slip joint where the Doug Thorley header pipe extension slipped on the header. (The instructions were not clear as to use of hi-temp silicone here.) A muffler clamp had to be purchased to try to tighten this slip joint. The header fits very close (too close) to the steering shaft u-joint. I feel that the heat from the header will burn up the grease in this steering joint. I do not see any other way in this application because of limited space. After these alterations, it bolted right up to the factory exhaust catalatic converter. As an experenced master mechanic, I expected these difficulties. The performance increase was good and it increase torque like they claimed it would. Except for installation ease, overall I am happy with this product. I feel it is the best on the market for this application."

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About David G.
I use my vehicle for
weedend cruiser
 
Doug Thorley Headers on the 5.7 IForce Toyota Tundra

Posted on 05/20/2008 by Samuel R. - 2007 Toyota Tundra (Pearl River,LA)

12 of 14 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"I have placed my Doug Thorley headers on my toyota tundra 5.7.I have also installed a voolant cold air intake and dual gibson exhaust.I have to say im very happy with the headers and the really add the complete package for my exhaust system.If i was yall.GO WITH THE HEADERS!!!"

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About Samuel R.
Vehicle
2007 Toyota Tundra
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