I have the same one. It doesn't change much. It's not loud or obnoxious. Mostly sounds stock but a touch more aggressive and a little louder. It added a little gurgle poppy-ness on decel in first and second gear for me. I love putt-puttting around in my apartment complex listening to it. Probably my favorite part about the thing other than getting me to stage 2. It's well worth what he is asking for it. I think we all paid $250 plus shipping for them. Something like that.