Pipe Decision for a 300EX
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I don't know how much more power you will get, but I think it is a big improvement over the origional ids. You should also rejet and put a hi-flow filter and the mods will compement each other. you will be letting more burnt gasses out so you need more fuel and air to get in the motor. If you drive a lot on dirt roads you may want to put a larger c/s sproket on for more top speed. I imagine you will hit the rev limiter with the pipe and jets if you don't change your sproket ratio.
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