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Doug Thorley Header, Tri-Y
Part #: THY-364Y-C
$2,117.69
$1,842.39
For pair
For pair
Free Shipping! *to continental U.S. only
Finish: Ceramic Coated
Featured Videos
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Video Description:Andy's got a chance to sit down with Jamie Joyce from Doug Thorley Headers to find out what makes Doug Thorley such a renowned header manufacturer.
*At 3:16, you can hear information about Doug Thorley's use of the Tri-Y header setup.
*At 4:58, they talk about their lifetime warranty, and what exactly about their products enables Doug Thorley to be able to offer such a strong warranty.
*At 6:10 you can hear what they say about the quality control procedures they put every single header through.
*At 7:20 Doug Thorley enthusiastically endorses Andy's Auto Sport as a great partner! -
Video Description:Check out this episode of Andy's Auto Sport TV where we explain all the basics about headers. In the video, we explain why headers open up horsepower gains and explain the difference between different types of headers. We also show how to install headers and then show the resulting horsepower gains with our dyno run results!
Fits On:
1973-87 GM Pick Up
Description:
It's A Proven, Indisputable Fact: Dollar For Dollar, No Other Investment Will Increase Power And Performance Like A Set Of Doug Thorley Headers!
Ceramic Coating, 1973-1987 Truck; 1973-1991 Suburban, 283-400, No Cat., 4Wd
Features
•Header Exit: Dual
•Primary/Collector: 1 5/8" - 2 1/2"
•Drive: 4Wd
•Dimensions: 20 x 11 x 36 (LxWxD)
•Weight: 47 (lbs.)
Notes
•Will Fit Angle Plug Heads.
•May Require Air Conditioning Bracket.
It's A Proven, Indisputable Fact: Dollar For Dollar, No Other Investment Will Increase Power And Performance Like A Set Of Doug Thorley Headers!
Ceramic Coating, 1973-1987 Truck; 1973-1991 Suburban, 283-400, No Cat., 4Wd
Features
•Header Exit: Dual
•Primary/Collector: 1 5/8" - 2 1/2"
•Drive: 4Wd
•Dimensions: 20 x 11 x 36 (LxWxD)
•Weight: 47 (lbs.)
Notes
•Will Fit Angle Plug Heads.
•May Require Air Conditioning Bracket.
You ever notice know how when car people talk about their engines, and then one of them mentions headers, the next question seems to always be, "Are they Tri-Y headers?" You can blame Doug Thorley Headers for that one. Not only did the company invent the Tri-Y header design way back in 1958, which allows spent gasses to escape much more efficiently, it has also been designing and manufacturing many other exhaust components for more than 50 years! Another reason to look into Doug Thorley Headers: they are still made in the U.S.A. Oh, and did we mention that every header that Doug Thorley Headers produces is C.A.R.B.-approved? Californians rejoice!
Q: For which vehicles is it necessary to buy a pair of headers? On your website are headers automatically sold in pairs for these vehicles?
A: When purchasing exhaust headers for a V-6 or V-8 engine, the header package is complete with two headers. If your vehicle is a 4-cylinder, there only a single header that is used.
Q: How much does the material used to make the header matter?
A: There are two main materials that headers are manufactured out of: ceramic and stainless steel. Ceramic headers are less expensive, but are prone to cracking if they get to be extremely hot. Stainless steel headers are more expensive but are more durable and generally more stylish. Stainless steel headers can take any kind of heat you throw at it and not prone to cracking.
Q: What are the different tubing options for headers and what is the difference between them?
A: There are two major designs for headers: the 4-2-1 design and the 4-1 design. In many cases 4-1 headers are designed for racing applications where the vehicle is being driven at or near redline. The 4-1 design maximizes top end power, whereas the 4-2-1 evenly distributes it throughout the power band. Either way, you're going to be getting more horsepower from a header.
Q: How do you install a header?
A: A header is a direct bolt-on. Simply remove the factory OEM exhaust manifold and the aftermarket header is put in its place. The header is to be attached the head of your vehicle. Remove all the bolts that hold the flanges in place and detach the factory manifold. The down pipe or exhaust pipe should be removed as well and then reattached once the header flanges are bolted back onto the head.
Q: What does a header do? Why buy a header?
A: An exhaust header is a performance product that replaces your factory exhaust manifold and improves an engine's performance by allowing air to flow more freely. The easier an engine breathes the more power it produces. Headers generally use piping with a wider diameter than factory tubing, which allows more air to pass through the exhaust system than factory. A header is one of the easiest bolt-on modifications you can make to increase horsepower, making an effective use of money if your goal is to quickly gain horsepower.
A: When purchasing exhaust headers for a V-6 or V-8 engine, the header package is complete with two headers. If your vehicle is a 4-cylinder, there only a single header that is used.
Q: How much does the material used to make the header matter?
A: There are two main materials that headers are manufactured out of: ceramic and stainless steel. Ceramic headers are less expensive, but are prone to cracking if they get to be extremely hot. Stainless steel headers are more expensive but are more durable and generally more stylish. Stainless steel headers can take any kind of heat you throw at it and not prone to cracking.
Q: What are the different tubing options for headers and what is the difference between them?
A: There are two major designs for headers: the 4-2-1 design and the 4-1 design. In many cases 4-1 headers are designed for racing applications where the vehicle is being driven at or near redline. The 4-1 design maximizes top end power, whereas the 4-2-1 evenly distributes it throughout the power band. Either way, you're going to be getting more horsepower from a header.
Q: How do you install a header?
A: A header is a direct bolt-on. Simply remove the factory OEM exhaust manifold and the aftermarket header is put in its place. The header is to be attached the head of your vehicle. Remove all the bolts that hold the flanges in place and detach the factory manifold. The down pipe or exhaust pipe should be removed as well and then reattached once the header flanges are bolted back onto the head.
Q: What does a header do? Why buy a header?
A: An exhaust header is a performance product that replaces your factory exhaust manifold and improves an engine's performance by allowing air to flow more freely. The easier an engine breathes the more power it produces. Headers generally use piping with a wider diameter than factory tubing, which allows more air to pass through the exhaust system than factory. A header is one of the easiest bolt-on modifications you can make to increase horsepower, making an effective use of money if your goal is to quickly gain horsepower.
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