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On 4 stroke motorcycles I've added more pipe on and increased both power and fuel mileage, it's all about having the right size and length for the engine size and RPM, get the math right and you will see an improvement.
Back Pressure is a myth, you can get exhaust back pressure gauges for checking for blockages and even with an over sized or shortened exhaust you will often see the pressure rise because you are loosing exhaust momentum! that momentum is helping a great deal.
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