I yanked the Big Gun that came with my bike and put a drilled stocker on. It seems alot quieter and I don't think I gave up much, if any, power. Though it adds some weight. Well, I got sound checked last year with the Big Gun at 95db. Yesterday the stocker tested 104db ! I couldn't believe it. Maybe I revved too high ? Assuming equal r.p.m.s, could the stocker be louder ? I'm thinking I'll put the lighter Big Gun back on.