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Doug Thorley Headers

103 Reviews
$397.26 - $1,427.57
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Product Info
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 Tube 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 (most vehicles)
  • Each model includes all necessary O2 sensor bosses for factory sensors
  • Proudly made in the USA
  • 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 (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.

Moss Warranty Act Statement

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.
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Customer Reviews

Average Rating
Appearance
Ease of Installation
Price/Value
Quality
103 Customer Reviews
5 Star
66 (64%)
4 Star
31 (30%)
3 Star
5 (5%)
2 Star
1 (1%)
1 Star
0 (0%)

So much better than the shorty headers

I couldn't be happier.
Posted By james a (lehi, UT) / October 16, 2020
Yes
No

Good quality.

Well made
Appearance
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Quality
Posted By Mehran K (Houston, TX) / June 24, 2020
2013 GMC Yukon XL
Yes
No

Poor QC and customer service from Doug Thorley

The bolt holes for the flange that mounts to the exhaust were only partially tapped and in poor condition. Calls to Doug Thorley customer service went unanswered and unreturned. I had to get a tap to finish the threading so the bolts could be mounted. Fit to the flange was poor and required copper gasket material in addition to the provided gaskets. Fit to the block was good. Headers look good and the truck runs good. Issue is with the poor QC and lack of customer service.
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Posted By william w (Laramie, WY) / June 5, 2019
2004 Toyota Tacoma
Yes
No

Awesome sound but needed modification

The bad: the crossover pipe didn't line up correctly on my 2008 Silverado 5.3. The exhaust shop had to cut, bend and splice to get it to work. Mine is lifted (suspension and body), so that may be the reason for it. Also, no gaskets included. The good: everything else is good. These are thick and heavy. The description says ceramic coated and the part # is for the chrome version... they are chrome (nice!). Sound is amazing with Magnaflow Performance series 24" (catless)! Very happy customer!
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Posted By Johnathan M (Jacksonville, FL) / August 2, 2018
2008 Chevy Silverado
Yes
No

Great Header!

easy instructions, easy installation, perfect fit... Love my Thorley..
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Posted By Christopher S (VAN NUYS, CA) / February 11, 2018
2006 Toyota Tacoma
Yes
No

Purdy Headers!

I ordered these and they arrived well packaged and quickly. I had a shop put these on for me along with some Magna-flow catalytic converters and a Flowmaster cat-back system, so I cant really comment on how hard they are to put in. I do want to say that they did not come with new exhaust gaskets for either end of the headers. I noticed a definite increase in horsepower and engine response, but I replaced the whole exhaust from the block back. Overall I give em 4 stars (a bit expensive)
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Posted By Bob B (Tacoma, WA) / January 3, 2018
2000 Toyota Tundra
Yes
No

2002 4Runner

Just installed, look great, sound fine, going with a aftermarket air filter, should be fine.
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Posted By Michael L (SAN MARCOS, CA) / September 8, 2017
2002 Toyota 4Runner
Yes
No

Tacoma 2.7 improved

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.
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Posted By MARCUS D (CORONA, CA) / May 9, 2017
2013 Toyota Tacoma
Yes
No

DTH for wrangler

Awesome item, bolted right on, used factory bolts lined up perfect. Nice packaging to keep it frm getting damaged.
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Posted By William B (Odenton, MD) / April 24, 2017
2002 Jeep Wrangler
Yes
No

Great performance gain

Great gain in performance, but did add a little more noise from exhaust.
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Posted By steve g (HIGHLAND, IN) / March 8, 2017
2008 Pontiac Grand Prix
Yes
No

Install

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.
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Posted By Stephen A (San Jose, CA) / February 21, 2017
1988 Toyota Pickup
Yes
No

I love these headers!

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.
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Posted By Larry E (Riverside, CA) / September 22, 2016
1997 Toyota Tacoma
Yes
No

5.3 2013 Silverado

I play proball and my buddy on my team has the doug thorley longtubes on his 09 6.2 silverado and he talked about it helping more with Power than even his Tuner. He wasn't lying. As far as installation goes. Just take your time and do it right. Take a day and do it right and it's not bad at all. Once you get the stock headers off putting the new ones on is not bad. Use PB blaster to loosen old headers. Much easier after
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Posted By Clinton f (JONESBOROUGH, TN) / July 25, 2016
2013 Chevy Silverado
Yes
No

Amazing - very satisfied.

I have put on several sets of headers over the years and it has always been a fight. My stock toyota manifold had cracked into two pieces and I had the choice of spending the same amount of money on a manifold from toyota or the headers. I opted for the headers and the install was actually easier than the removal. I would have never guessed that it would be that straight forward. Performance it seems that my mileage is up slightly and the engine rev's more freely up to the 6000+ RPM range.
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Posted By Robert W (CAMARILLO, CA) / July 13, 2016
1998 Toyota Tacoma
Yes
No

Easy installation, increased performance

These headers are worth the money, especially if you're lifted. Brings back the performance lost from big tires and heavy bumpers.
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Posted By Charles K (NAZARETH, PA) / June 4, 2016
2004 Toyota Land Cruiser
Yes
No

09 Silverado 6.2L

Pros: Great quality, easy to install if you know what you're doing, added power, sound. Fit 6.2 Cons: better check bolts after driving it repeatedly cause they aren't locker nuts and they come loose easy, had three bolts come off in first week. Needs better directions, Have to get the y pipe welded At a muffler shop Overall, great headers and great quality - made is USA
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Posted By Zebulon S (BETHANY, OK) / March 19, 2016
2009 Chevy Silverado
Yes
No

Awesome Headers

The Dough Thorley Headers are awesome. They didn't change the sound of my stock exhaust too much, which is what I like, peace and quiet when cruising. Though I love the deep throaty growl at WOT. I only wanted a little more boost in performance, available get up and go power when I need it, from an off-ramp to hauling a full cargo. The Dough Thorley Headers have proven worthy. Also, thank you AutoAnything for a great deal and excellent service.
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Posted By SHAWN A (WAUKEGAN, IL) / March 13, 2016
2009 Nissan Xterra
Yes
No

nice product.

Love these headers. High quality construction and beautiful finish
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Posted By christopher p (MINNEAPOLIS, MN) / January 29, 2016
2010 Chevy Colorado
Yes
No

Very good quality

Very impress with the quality put in, heavy gauge, and plating of headers. The graph they used for power & torque was unbelievable. Which show twice as much as stock, something you get with maybe a supercharger. It was too hard to believe, and I know I didn't get anywhere that. One thing the manufacture wouldn't answer for the 05 Tacoma 2.7L was why the tubes weren't of equal length?
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Posted By robert f (OCOEE, FL) / December 21, 2015
2005 Toyota Tacoma
Yes
No

Great

Love it
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Posted By Matthew G (Annapolis, MD) / November 11, 2015
2009 Chevy Tahoe
Yes
No

RaH

Beautiful looks. Great quality, pricey,but you get what you pay for.
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Posted By Roger H (Bemidji, MN) / August 21, 2015
2009 Toyota Tacoma
Yes
No

Hard to install

As the title says they are hard to install partly because of weak instructions. My biggest issue with the headers is the y pipe did not fit my stock exhaust. Had to go to exhaust shop for them to put in the stock connector which cost another $60. Good stuff but you'd better have lots of tools, patients, time and an exhaust shop handy to get these in with any ease. That being said Ive noticed good power increase and they make the truck sound perfect with stock catback!
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Posted By Cy S (Dallas , TX ) / March 5, 2015
2014 Chevy Silverado
Yes
No

Awesome pipes

This is a great sounding set of pipes, and great looking. Also a big power and performance gain. Great deal!
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Posted By Christopher T (VANCOUVER, WA) / November 26, 2014
2011 Toyota Tacoma
Yes
No

Headers, the only way to go.

I have been looking for a set of headers for my car for sometime now. The Doug Thorley headers look great, sound mean, the price was right but they were a real chore to install. I would buy them again.
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Posted By Michael N (Phoenix, AZ) / July 16, 2014
2006 Pontiac Grand Prix
Yes
No

Sweet!

While it wasn't the easiest to install, it was sure worth it. I do recommend buying new studs as well as crush gaskets for the piping after the header. Sounds great, gave the performance and flow I was looking for, and look badass!
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Posted By Arturus M (fayetteville, AR) / May 7, 2014
2003 Nissan Xterra
Yes
No
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