A resonator is a must have, without one the low-rpm drone inside the car will make it seem louder then it really is. I'd say you could still keep the performance and go 3" with a resonator or two and and a magnaflow muffler.
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-Jim
“Equality, rightly understood as our founding fathers understood it, leads to liberty and to the emancipation of creative differences; wrongly understood, as it has been so tragically in our time, it leads first to conformity and then to despotism”-Barry Goldwater