Yosh RS-3's are always a good choice especially if you go carbon or titanium and they're slim so you get great ground clearance on a full lean. I myself will be purchasing Akrapovic's in the summer...a buddy has bolt-ons on his Busa, and I think they sound better then Yoshi's and he was very happy with the power gain, although you end up paying $100-$150 more for the Akrapovic. -Gino