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-   -   1 5/8 headers Vs 1 1/2 on a 3.0 (http://forums.pelicanparts.com/911-engine-rebuilding-forum/432616-1-5-8-headers-vs-1-1-2-3-0-a.html)

matty74 09-27-2008 12:56 AM
1 5/8 headers Vs 1 1/2 on a 3.0
 
Will a 1/5/8 header give you better performance that a 1.5 header like ssi?

hypothetical.

RSR spec motor with webers would the former allow for better performace vs the ssi?

chris_seven 09-27-2008 02:22 AM
We have a 3.0 litre Twin Plug motor running 10.5:1, 1.625" headers with GE60 cams, PMO 46IDAs which produces about 280 bhp with a very flat torque curve from 2750rpm.

Never tried smaller headers or SSIs


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