The Honda CBR250R sells in almost all the major markets that Honda has its presence in, and it was just a matter of time before the after market tuners developed something exciting to squeeze out some more performance from the CBR250R. The first prominent tuner to announce their product for the motorcycle are the Two Brothers Racing and its the Honda CBR250R V.A.L.E. Slip-On Exhaust Systems.
Two brothers claim a 6% bump up in peak power over a stock Honda CBR250R, better acceleration figures and a more liner power delivery. Also there is a drop in weight due the lack of the catalytic converter. Here is the Dyno chart:
With prices hovering from 419$ to 560$ and add to that shipping and other taxes the system is not exactly cheap!
Here is a video of a CBR with the exhaust on: