straight pipe

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What exactly do you mean by 'straight' pipe. Two strokes need the expansion chamber in the pipe for backpressure. I'm no expert but it has something to do with the fuel pressure and how the vacuum draws the fuel into the chamber if I'm not mistaken. I run the Extreme RC mods end bleed pipe and it's effectively a straight pipe with an expansion chamber. The expansion chamber is what makes it a 'tuned' pipe, and it's how different pipes can give you more low end or top end power. It's all in the shape and length of the expansion chamber. My pipe is loud as could be on the LRP Z.28R Spec 3. I highly recommend this pipe if you can get one. This combo is insane for an out of the box motor!
 

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