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What you loose is torque . I found that short open exhaust cost about one or two ft lb of torque. Plus added noise.
Long pipes seem to be the best for scavaging. The best system I ever made was 57 inch primary pipes and long cones. Then a reverse cone at the end. I kept open I g the outlet until the power stopped going up. About an inch and a half .
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Top speed 123.369mph. Ohio mile
Worlds fastest 250 ninja
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