Invidia Gemini or HKS Hi Power

ColtronZ

Personally all exhausts are quiet except single exits, until you pair them with test pipes. I would recommend doing it yourself if you have the tools. It's probably the easiest thing you can do to the car. Lastly, I wouldn't tune unless you either do tp/hfc or an intake as an exhaust generally doesn't provide enough benefit for $600+ tune. Generally an aftermarket exhaust provides more airflow over stock anyways, so you should see a benefit afterwards.

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318hp/255tq made by FI Res Test Pipes, FI Non-Res Catback, Z1 Intakes, and EcuTek Tuned by RS-Enthalpy