exhaust system for 4 dr gsr... ???

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so does anybody know if 2 inch piping will give me gain or loss in performance?????
 
I think the GSR is just under 2" stock.. so I doubt it would help very much. I would go at least 2.25".
 
i went 2.25..... i dont feel crap... but at least my headers look nice... oh yea im selling a magnaflow cat..... stock gsr headers.... and a 4.5 inch muffler??? if anybody is interested let me know... im selling them for cheap.... real cheap....
 
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