I can’t say for sure. But I feel that I get more rasp as the exhaust heats up. It’s weird and could be nothing, but If I go on a spirited drive, I get less rasp at the beginning of the drive then at the end. It is also more rasp when I really get on it. It’s like a get a little rasp at first but then is fine. If the windows are closed I don’t notice it, only with windows open. Sometimes I get a little during a shift. I was thinking it was the Q300 getting louder or the package material changing over time. But can’t say for sure. I really need to have my wife do some drive-byes so that I can hear it from outside. I punched it once in a tunnel and it was very noticeable as it reverberated off the wall. I guess you could say it’s a work in progress.

Haha yea, heat for sure plays a role with exhaust volumes. My catback sounds fairly nice and aggressive when the car is still coldish, after driving for awhile on a hot day, I almost can't hear it anymore. I also hear every little clunk when I'm next to a wall, I learned to ignore all of that.

Wish I had someone close to me that knew how to drive stick so I can hear how my car sounds from 3rd person, since here in America most don't know how. :bonk: