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Will I blow my motor? How much back pressure?


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I had a stock banshee, I put a boost bottle, 13 tooth front sproket, K and n filter with moded air box and moded my stock pipes. All I can say is this thing really rips now. OK here is my big concern. I Took the three screwqs out of the back of my silincer and removed that part. Then you have the cap with the internal guts. I had a buddy cut the whole guts out. He went fluch with the end cap and the curved pipe piece fell off. So he welded the curved piece onto the cap. The other one he cut just above the ring so it is a hair away from being cut flush with the other one. My question is will I blow my motor or need rejetting, do to this mod? How can I tell if I need rejetting? banghead

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