| modify your stock pipe
if you have a mini p bike and feel you wan,t to modify you stock pipe for better perfomance useing your stock engine i must say, try this trick;
add an exrta 30 mm of pipe to the straight section of the header pipe also add 75 mm of pipe between the two cones [cut middle weld] add this 75 mm length between both cones. also lengthen the section between the end of the pipe and where it meets the stinger/muffler by 100mm. i have just done this mod to my sons bike and the difference is worth the effort. please note; if you have the money to purchase a large volume pipe do so for even better results, if you like to tinker on your own stuff try this mod. and don,t leave any iron filings inside materials you need are; hacksaw, same diameter pipeings [3 of] and a welder. if you don,t have access to a welder ,take all ready to weld pieces to an exhaust shop where you also can obtain the sections of pipe you need probably for nicks and have it done for you, i would think costs of $10 to $20 max.
worth a go.  | 
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