Maybe this is a bit late and you already have the answer but I have a TT600 and have fitted a power commander and a carbon can exhaust(street legal)and its like riding a different bike, smoother throughout the rev range and much much better a low revs 2000-2500, this is where I had problems. Bike suffered with vibration and the hands went a bit numb but this seems to have dissapeared with the PC fitted. My advice GET ONE but have it custom mapped on a rolling road at a Dynojet centre or agent.