OK, I have the FI cat back with 18" resonators. There is a lot of subjective opinions on how loud or acceptable the sound is. So let's turn to science.
Stock readings in decibles
Cold interior 81db
Cold exterior 85db
Warm interior 78db
Warm exterior 80db
FI
Cold interior 92db
Cold exterior 90db* was warming quickly in the summer, actually reading is likely a few db higher.
Warm interior 79db
Warm exterior 85db
Remember every +3db doubles the amount of energy. +10db for perceived loudness.
Personally I found upon initial install I loved the sound at idle, but it was much louder with drone at speed, depending upon load. It's a sound I've grown accustom too, but most of us do not use the Z for a daily driver, at least not for long distance.
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