I was waiting to write this review until I had a better chance to really give it a workout, we took it to silverlake this last weekend, what a difference! I had Whalens install a KWI clutch kit, unlock the ECU to get rid of the speed limiter, the latest tune for stock injectors all at the same time, so I cannot tell you exactly which made the biggest difference, but WOW did it really wake this thing up. Raced my friend with the exact same machine, same tires, completely stock, it was like he was dragging an anchor. While it was not cheap to do, I am satisfied with the resluts, I would not hesitate to do it again, and who knows, might do more in the future!