I don't think there is one single muffler out on the market for any car that has zero resonance and flows worth a damn. There is a lot of bs out there in the exhaust market about zero resonance and 50hp gains etc etc. Even the oem muffler has a tiny bit of resonance under certain loads at certain rpms. If you want a louder muffler then you have to accept an increase in cabin resonance as well. It's a package deal.
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