I would say the best upgrades are the Yoshimura exhaust and the fairing. The RS3 exhaust gives a bit more BHP and torque and the fairing deflects some wind for us tall riders. The monkey for me is a thing of passion, its never going to be a quick bike, however its got character and every ride is fun. I have had plenty of big bikes but I get much more enjoyment from the Monkey. To get the best out of your monkey make it your own. Plenty of modifications on offer, I still have a few more to.make but won't change the gearing or modify the engine!