I've got a Supersprint Street muffler. It has no baffles like the stock one. Was told I'd see about 2 decibel increase in sound...that was correct. Pulled the resonator about 1 more decibel increase, just a guess. I can now hear the exhaust where as before, totally stock, I couldn't hear a thing. I have not had someone drive the car as I stood by, perhaps I should try. As a comparison I'd say it's about the same increase, perhaps a little less, as putting BMW's performance exhaust on a 328i, which I did. It's a subdued but quality sound. Hope this helps. It's all very subjective. I've got a stock muffler, including the plumbing through the bumper and tips. Make me an offer, cut it open and play with it?
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