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
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