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3 inch or 3.5 inch downpipe?

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GNJesse

I wanna run tens
Joined
Oct 12, 2003
Messages
77
My motor setup right now is: Rebuilt stock bottom end, ported heads with bigger valves, 204-214 cam, ported intake, bigger throttle body and a 63-1 four bolt turbo. Since I bought a four bolt turbo I am making a custom downpipe for the car. Should I go with a 3 inch or 3.5 inch downpipe. I plan on make the car faster next year. Im lookin for nines next year with a different motor so I only want to make this downpipe once. So i just need to know if i should go 3 or 3.5 inches. Thanks.
 
Go 4 inch if you can, or even bigger. You can never go too big on the downpipe. If 3.5 will fit, run it.
 
Agree,

If you can do the 3.5", it would be preferred. Easily handle the larger 70-76mm turbo's power/exhaust requirements.
 
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