3 inch or 3.5 inch downpipe?

[GNJesse]

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.

 

[forcefedhatch]

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.

 

[Joe Lubrant]

Agree,

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