that is more proof that the current 20" low rpm test is useless , there is no way the 250 with a Q is louder than the 450 with the yosh w/ insert at full throttle , that is why the FIM has a new full throttle sound test and until the new 2 meter max sound test is the new standard we will have to put up with this type of bs I just went and checked out your sight. Looks like you have a quality product. I have a 2010 450, and was looking into getting an exhaust and a tuner and some other changes over time,(wife won't let me blow a small fortune on things like this right away). I had checked into yoshimura, it seems to be one of the few that expands into the muffler chamber. Anyways when the time is right to buy a pipe I would like to know what I want to get. Do you have much experience with your pipe on the yamaha '10 450? I would like to keep my low and mid power and increase a little top end if possible. I don't care about a spark arrestor or the bike being really quiet. Honestly, will your pipe help me accomplish this? I am seriously interested in your product, although a purchase might not be made right away, thanks.