Im not sure but i heard the bigger the better. Is that true with exhuast when you have a turbo??????

 

y is this a poll

anyway ya... bigger is better when you go above 6psi
low psi's there is not much gains on a 3inch...

 

If a turbo could choose an exhaust, it would say none at all. If it has to run one on the street, it will choose the free-est flowing one availible. From building a full 3" exhaust for a 93 GSR, I can tell you, 3" is about all you can fit.

And yes, at any boost pressure, bigger exhaust from the turbo back is better. Think about the principles that spool a turbo and then it makes sense. At any boost pressure.