loudest , biggest hp gains, slip on for 07 cbr600rr
 

hi i just purchased an 07 600rr and i was wondering what is the loudes/best sounding, biggest hp gains slip on you can buy, i am leaning towards, devil, yosh rs-5, jardine rt1, or two bros? any suggestions???? and yes i have tried searching

You're never going to get a straight answer on that. Much of it depends on what else is going on with your personal bike. beyond that, everyone claims their pipe is the loudest and gives the most HP. Most people on this board (or in general) don't even have the means of actually measuring HP fluctuation, so there's no sense in bothering with that.

i hear ya, when i did a search i got so many mixed answers