I'm looking at upgrading to aftermarket intercooler kit and had a question regarding intercooler core sizes. I got the car tuned yesterday ets intake, ams test pipe and catback 26psi stock turbo and intercooler. The car made 334 awhp and 374tq.

So seeing what power I'm making what would make a good core size? 3", 3.5",4"? What are you guys using with the stock turbo?

 

Go 3.5 perfect size and will fit your need if you decide to upgrade more in the future and either ams or ets would be a great choice