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bigger is better, so go with what you can afford. i went with the 3" because i hate doing exhaust work. i made sure that it was the last exhaust i was going to have to install, so i went with the 3".
 

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2.5 will help w/ the low end but if you have a larger turbo you want to be able to wind out in the top end, I'd go w/ 3 for sure.
 

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