for a while. While still louder than stock (tp's and dp's) it was still as quiet as most stock sporty cars. When pulling away from people they don't even hear you. Of course, my friend bought an '03 Z06, and I had to pull out the stops to try and keep up. Off went the stockers and on went the Greddy SP's. The power difference is definitely easily noticeable. I'm not sure I could ever go back now. But, it was nice while it lasted.