if it's an internal gate it will tend to creep, but with an external it shouldn't creep much if at all, and for a turbo set up, no matter how many cylinders, the best exhaust is no exhaust. So a 3'' is great for a turbo 4 cyl. You tend to lose low end with a bigger exhaust on N/A applications but with a turbo you tend to spool faster and may actually gain low end.iLLeFFeKt CiViC said:so you're looking to swap out your 2.5" downpipe for a 3" one right?
i would leave it alone for now untill you get a bigger turbo or something.
if you go to 3" now you might experience boost creep and a tad more turbo lag (if any).