I had the Nismo exhaust installed yesterday and I'll have to admit I'm a bit disappointed by how quite it is. Since I have a roadster and the top will be down more often than up I didn't want it too loud but I was hoping it would be a little louder. The Nismo exhaust does sound deeper and a bit louder than the original pipes, but the difference is so slight that I can't tell at all when driving with the top down in traffic. On the other hand, I only have 600 miles on my car and I'm trying to follow the owners manual break-in instructions so I haven't heard what it will sound like at full throttle.
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