Im going with a HTAGT35R setup and BR Race Fmic and all supporting mods stock TB and intake mani what size intercooler piping should I go with 2.5 or 3"? And why.

 

buschur has already tested the 2.5in icp's vs the 3in and didnt see a change in hp and he was at like 6xxwhp at the time. 2.5in ic pipes are enough for prolly 99% of evos

 

What pipes you have to choose if you have a 37R or 42R ???
Or what pipes you need if you have a q45 TB ?

 

im not 100% sure but with the 37r 2.5 should be fine but if you move up to the 42r you would want to put 3in ic pipes because the outlet of the 42r is a 3in vband type flange, and you would have to make sure your ic has 3in inlet and outlet...

 

I asked the same question to another topic.
I have 2.5" intercooler outlet and a 3.5" q45 tb... so what UIPC diameter should I use?