My friend has one on his trx450r and it is LOUD. I will say that it needs repacked so it could get quiter. Also the 450 sport bikes are ushually loud as hell anyway so that might be it. I would think that HMF would have their utility pipes in more of a mild state like you want. I can say you will notice a power increase big time :smirk:I want one that will last not to loud but not to quiet either. Something reliable will do me good.