I have a t67 .96a/r and the sts kit came with 2 pipe. well im nw upgrading the block and want to up the boost to 12-14 and want to run 3 pipe from infront of the axle to the intercooler and 3 out to intake. Is this pipe too large if the boost is 7-9 on the low side and 10-14 on the high? should i go 3 or smaller? whats the pros and cons Thanks

 

The STS kit isn't going to be 2", it's 2.25" or 2.5".
3" is fine. You may notice about .3 miliseconds more lag if that's what you're getting at.

 

Thanks for the input. i was trying to ask about lag but guess forgot to mention it.

 

http://www.youtube.com/watch?v=rdjh3EY6shU

 

I went from 2" dual in/out intercooler to dual 2" inlet and 3.5" single outlet and what ever turbo lag I had was gone. For you since your kit is in the back I would think you would not lose that much lag... 1/4 to 1/3 of a sec. from closed to wide open throttle. Don't forget that the charge pipe from turbo to intake manifold stays charged with boost.