Two Brothers have released their V.A.L.E. Slip on exhaust systems for the 2011 Honda CBR250R. This exhaust is lighter and less restrictive, thereby not only increasing horsepower but also mileage. With this new exhaust your CBR250R will have an increase of 1.43 bhp of power and 0.82 Nm of torque. That is equivalent to a 6% gain with the catalytic converter being removed from the motorcycle. The O2 sensors are not tampered with as the exhaust consists of a muffler replacement and not a full exhaust change. But factor in the price which is upward of Rs. 20,000/- and all of a sudden you think its better to opt for a custom made end can. However if you still want to buy one, you can head over here.

Performance Specs (with Juice Box Pro)
Peak HP23.01 HP24.51 HP+1.84 HP = +9%
Peak Torque15.67 ft-lbs16.69 ft-lbs+1.5 ft-lbs
Max HP Gain+1.84 HP @ 7800 rpm+ 6% hp
Max Torque Gain+1.5 ft-lbs @ 3500 rpm+7%
Weight15 lbs5 lbs-10 lbs
Sound87.5 dB @2000 rpm
O2 Sensoryesyes