No! Your 650 is capable of much higher speeds. Buying a bolt on silver bullet will not make an improvement nor does it make any sense! It's not glamorous, it's not exciting and it doesn't come with any flashy decals but the best thing you could buy is a simple shop manual. Read it and learn how to tune your 650 properly. Purchase some appropriate tools to get the job done. When you complete these steps you'll look back on this question and understand why it is silly.
