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oh yeah...as for the exhaust, bigger is better with a turbo. 2.5" may be sufficient enough at lower boost levels, but you'll benefit more from 3" piping from the turbo back, especially when you're planning on running higher boost in the future. it would be better to remove the cat, but if you want it in there, i'd suggest getting a 3" high flow cat. you want the least restriction you can possibly get. also, like oldsman said, just do a single pipe out the back, otherwise you're causing unnecessary resistance and turbulance with it split to 2 pipes.
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