I can honestly tell you that you will hate yourself if you tried any exhaust larger then a 3" on a NA. A 2.5" exhaust will do you just fine, Really to go with a 3" I would say you would need a decent port job otherwise we are just talking about making noise. I don't know what other mods you have or plan to have in the near future, but that's my suggestion. Anything bigger is for the turbo cars & big port NA's.
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