Listen I am about to buy 2010 CBR 600RR this will be my 3rd 600RR. And obviously 03-06 no cat just got some resignators on the exhaust only on the 05-06 I think. But as for the newer models they now have a cat:cursin: . So I am going to peace together the loudest and probably the nicest sounding (In my opinion) exhaust you will hear for a street rider! (I will put some kind of fly by video on soon!) It is going to have a two bro racing header with TBR filter and Velocity stacks Along with a hyper-flo slip on! Going to make a nasty combo! But my question is I am going to run into a problem with O2 sensor and the cheack engine light coming on? And if I do how do I over come this problem so the engine light does not come one! Because it is really annoying FOR ME when ridding and that light is on! Thanks guys!