what size exhaust?

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evilgsr

Member
its time to order an exhaust system for my gsr, car is stock for now but i was wondering if a 2.5 inch would be about the right size for a mildly turbocharged engine (street car,daily driven) was looking into getting a greddy evo system any opinions/experiences on other brands appreciated though B)
 
how much would i hurt my performance while my engine is still n/a if i got a 3 inch exhaust
 
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