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Doug Thorley

Optimize Your Exhaust with Doug Thorley

Doug Thorley Headers is a well-respected manufacturer known for its exhaust systems and headers, particularly for American muscle and classic vehicles. With a focus on enhancing engine efficiency and sound, Doug Thorley products are designed to deliver both performance gains and durability. Doug Thorley offers a wide range of headers, including long-tube and shorty designs, crafted from premium materials to optimize exhaust flow and improve horsepower and torque. The company also offers a selection of performance accessory parts, exhaust tips and gaskets, designed to complement their headers and exhaust systems for a complete performance upgrade. Shop your favorite Doug Thorley exhaust products here at CPP.

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  1. Doug Thorley Shortie Header for 2002-13 GM Silverado

    2002-13 GM Silverado/Sierra, Suburban, Tahoe/Yukon, Hummer H

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    In Stock
    Part # THY-309-C
    0%
    $635.91
  2. Doug Thorley Tri-Y Headers for 1961-87 Chevy Truck

    1961-87 Chevy Truck 283-400 Suburban, Blazer/Jimmy

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    In Stock
    Part # THY-300Y-C
    0%
    $1,195.00
  3. Doug Thorley Headers, Stainless Steel Headers

    05-09 Lexus GX470, 4Runner, 1 5/8th Tubes, 2.5" Collector, Off-road use Only

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    In Stock
    Part # THY-561-SS-C
    0%
    $975.00
  4. Doug Thorley Tri-Y Headers for 1963-66 Chevy C10

    1963-66 Chevy C10 with LS Swap All LS (Except LS7)

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    In Stock
    Part # THY-322Y-C
    0%
    $1,195.00
  5. Doug Thorley Long Tube Headers 3:1 Race Only

    Race Only (See More Information For App.)

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    In Stock
    Part # THY-465-L-C
    0%
    $795.00
  6. Doug Thorley Long Tube Headers 4:1 (2" Primary Tubes) for 1968-78 Chevelle/El Camino

    1968-78 Chevelle/El Camino, 454-502 Big Block

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    In Stock
    Part # THY-351-C
    0%
    $723.00
  7. Doug Thorley Short Tube Headers for 2005-09 Toyota 4 Runner

    2005-09 Toyota 4 Runner

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    In Stock
    Part # THY-563-SS-C
    0%
    $1,284.00
  8. Doug Thorley Tri - Y Headers for 1973-89 GM Pick Up

    1973-89 GM P/U, Suburban 366-454 2Wd Big Block V8

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    In Stock
    Part # THY-303Y-C
    0%
    $1,031.74
  9. Doug Thorley Tri-Y Headers for 2007-14 Toyota Tundra

    2007-14 Toyota Tundra, 5.7L, 2/4Wd ("Race" Use Only)

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    In Stock
    Part # THY-560Y-L-C
    0%
    $1,421.00
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Frequently Asked Questions
How can I tell if an item is in stock?
You can check the availability of an item on the product page above the item price. If an item is in stock, in green text it will say “In Stock”. If the item is unavailable it will say “backordered” in red text. You always have the option to purchase a backordered item that we will ship to you once it becomes available. For any backordered items purchased, our team will notify when the item is now back in stock and ready to ship.
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Why can't I find the part I am looking for?
Can't find what you are looking for? Some times it is just the terminology you are using. But don't worry! We are hear to assist you. You can use our Part Finder feature to search by application or you can give us a call and we can help you locate it with the part number. Also, if you don't want to deal with technology, give us a call at (714) 522-2000 and place an order with us over the phone.
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What shop promotions and discounts do you offer?
We offer a variety of promotional discounts including military discounts, advertisement discounts and sales promotions. The best way to stay updated on our latest promotions is by signing up for our newsletter. You can sign up for our newsletter by entering your email at the "Be the First to Know" section on the bottom of the page or by subscribing on your account page. To learn more, please email us at info@classicperform.com.
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How do I find my instruction sheet online?
There are a couple ways you can find the instruction sheet for your products. In most cases, instruction sheets can be located in the Tech Resources section on the product page. Not finding it there, you can also search for it by visiting our Tech Resource page and selecting the option for "Installation Instructions". Still not seeing it, give us a call at (714) 522-2000 or email us at info@classicperform.com and we will email it to you.
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