2.5 inch for 600 whp.
your question is too vague. is it a street car? what turbo... more details for a better response.
yes street car and some track use its a built lsv stock gsr cam and running a 6262 .82a/r t3 I have a 70mm tb and my question is not base on my setup I want to know will 2.25 intercooler piping support 600hp. I want to know whats the max hp you can get out of 2.25