Laser Can
As I see from your profile you have an 1150 you should go for the full system. The Pro Dor is a proper race can not just a noisy megaphone add on. Comes with a chip allowing the engine to run better with the new exhaust.
Used on the Boxer cup bikes, had mine on for 30k + miles and love it. Reminds the older folks in Kent of a low flying Spit when it is opened up and is quite acceptable when pootling along in town. Use mine every day into London and all that Mr Plod wants to know is what is it and where can he get one!
Cooperman