I bought this exhaust for my 2012 rmz450 and before i put the exhaust on the power was really snappy on the bike but when i installed this system it really smothed out the power and made it much more controlable. The only thing that bugs me a little is that it's longer than the stock pipe but i can live with it it still worth every penny.
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If you run your rpm up to the rev limiter the db's may go as high as 100 to 102+db's.