Take that 700 bucks you plan to spend on an aftermarket system and spend it on SUSPENSION—a mod that most people don't do that will actually allow you to go much, much faster. All you need for the the GYTR tip for the WR muffler and you'll have all the power you need. Too many people waste money on mufflers just to make their bikes sound different and look cool. I read that dirt rider article and it simply exposes that all the fuss about aftermarket exhaust systems on MX bikes is a big joke. Stock systems on MX bikes have no flow restrictions and were designed to compliment each motor in a specific way, with the maximum amount of power available.