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Sound. Every exhaust system or muffler has its own unique sound. You can add a Magnaflow muffler to your exhaust for a pleasing, slightly louder-than-stock tone, or you can get an aggressive growl out of a glasspack Cherry Bomb muffler.ufflers. If your exhaust system ended at the catalytic converter, your vehicle would be obnoxiously loud and noisy-far from the high-performance growl you know and love. As their name implies, mufflers reduce the noise coming out of your exhaust to less-than-deafening levels.
Piping is 2.5in inlet from the cat to two 2.25in outlets. It has a nice deep throaty sound, pretty loud if I'm driving hard but fairly quiet under 3k rpm and it doesn't drone. Good mid-range torque response. Just some comments on a few of the exhaust that you mentioned from what I've seen on my friends cars though. The HKS hipower resonator hangs kinda low, apexi dual N1 looks nice and pretty quiet, BC spec2 is deafeningly loud...love it.