I bought my Busa with only 575 miles on it, and had the Two Brothers slip ons installed before I picked her up.
The price was so nice, I got a Shoei helmet basically for free! It sounds really good to me, a little deeper tan my buddies Scorpion slip ons and I personally like the carbon fiber weave on the pipes.
Last night my son and I installed the Juice Box pro and K&N filter and it sounds pretty wicked and the throttle response is crazy!
Rolling today so I'll let you guys know how it feels.