help on diameter pipping for turbo around 350hp

[sbvtec74]

2.5inch 2.75inch or 3inch better ?? thanks a lot ....

 

[EK9turbo]

3"

 

[RagingAngel]

what the man said above!

 

[blinx9900]

what kind of piping? exhuast or intercooler?

 

[sbvtec74]

i mean exhaust pipping ..