A full 3" exhaust is really recommended for a TT kit around 500whp. You MIGHT be able to hit something close to the range you're looking for with only a 2.5" exhaust, but you're going to have to push the engine a little harder to make up for the loss of power from the smaller exhaust.
And in my honest opinion, the 500HP 370Z we had here sounded AMAZING! It was definitely louder than stock, but it wasn't raspy, or obnoxious by any means, and it didn't drone at all either.
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