To put things in perpective, the sprocket gearing is all math. Taking the difference between a 13 tooth and a 14 tooth front sprocket provide a 7.2% change. In this case, going from the stock 14 to 13, this will provide a 7.2% increase in torque but loose appx 7.2% on the top end. The reason for not really noticing the difference on the top end is because you cannot hit the rev in fifth gear with the stock sprocket, but you can with the 13 tooth sprocket. Basically having very similar top end while having a lot of low end. From a stock perpective, doing a tooth drop is well worth the 15 dollar investment. As for myself, I do not know what kind of difference I will see having a pipe kit. I will have to do some experiment and see what kind of results I get.