I have a Stillen SC in my 2013 sport touring 6MT. I also have the NISMO cat back exhaust. I only really hear the SC over 5K rpm, and then I like the turbine sound. The NISMO is not loud, but it does have a sweet rumble, but I am sure some others may sound better (for me better is deep rumble or "burble" without harshness.) "Mellifluous" is the right word.

If I could make my Z sound like an SRT Challenger, that would be ideal, but totally unrealistic

Which fast intention exhaust is recommended if supercharge. Non resonated, 12" or 18? I don't want my car get raspi.

6 year old thread.