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Doug Thorley Headers at Andy's Auto Sport
2 items available
Headers
On Sale!
Doug Thorley Header
|
THY-555Y-C
|
$410.00
$377.20 /Pair 
|
On Sale!
Doug Thorley Toyota Y-Pipe Assy
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THY-RYP555
|
$78.00
$71.76 /Pair
|
About this Manufacturer:
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!
Frequently Asked Questions
What does a header do? Why buy a header?
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.
How much does the material used to make the header matter?
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.
What are the different tubing options for headers and what is the difference between them?
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.
For which vehicles is it necessary to buy a pair of headers? On your website are headers automatically sold in pairs for these vehicles?
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.
How do you install a header?
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.
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.
How much does the material used to make the header matter?
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.
What are the different tubing options for headers and what is the difference between them?
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.
For which vehicles is it necessary to buy a pair of headers? On your website are headers automatically sold in pairs for these vehicles?
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.
How do you install a header?
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.
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