It sounds nice but not to loud, no more than my 110 SE with Rienhart but it has BASS. I filled it up with race fuel (110 octane) down the road this morning and filled the Methanol tank. I rode all day pretty damn hard to get used to the bike. I met a guy that said he knew the bike and was present during a dyno run and that it was 165 at the rear wheel. I somehow doubt it, the dealer told me 160 and I doubt that to, but I am a HP skeptic. I have no idea how much HP the bike REALLY has but I can say this for sure, I cannot give it full throttle and hold on the the handle bars. My hands hurt from trying to hold on all day. I figure the bike sat for along time, the more I rode it the better it ran. Its a kick in the ass thats for sure, the boost comes on strong and the methanol keeps it from detonating. I have not ever driven or ridden anything as fast as this bike so whatever the HP, its enough. I let my friend ride it and he went down the road a short way turned around and came back, after parking the bike he said no thanks man, thats not for me and got back on his rice rocket. LOL!!!!!!!
Something else thats cool, ever gear shift is followed by a cool PSHHHHHHHHHHHHHT of the blow off valve releasing pressure, I know I am a big kid.