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Well, I did a custom 2.25" cat-back exhaust using an arospeed N1 muffler. I haven't really noticed a performance increase but it sounds great. Resonators are the key to a good sounding exhaust system. If you remove the resonator and do not replace it, your car will be loud. Some people like that - I don't.
if you already have a free flowing muffler, just add a resonated tip like power tone mini tip, or go with the phantom muffler + mini tip. this combo gives out a deeper sound but not irritating loud.
65 installed...helps a lot to make it quieter...tone wise...eh...i had a really good tone before...now not the same i think...maybe it's just quieter =P