I just came from a Ninja 300, so I'm thinking the engines are very similar, if not the same. While an aftermarket exhaust won't increase power, it will reduce weight and sound so much better! Your best bet to increase low to mid range pull is to either drop a tooth on your front sprocket or go up 2-3 teeth on the rear. The only real downside to that mod is that it lowers your top speed and throws off the speedometer, but there are fixes for that (check out SpeedoDRD). Hope that helps!Ok, not worth the cost gotchya. Thanks. Dont want to make my mpg any worse for that matter anyway. Ill just be stuck with it sounding like a childrens toy.