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Old 07-28-2009, 05:32 PM   #5 (permalink)
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Join Date: Mar 2009
Location: Massachusetts
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It depends on the rpm range you're trying to make best use of and how restrictive the stock exhaust is. Different diameters, lengths, changes in volume all affect exhaust pulse velocity and scavenging (narrow rpm range where exhaust pulses reflected back from volume changes in the pipes return at the right time to help pull the exhaust through an open valve).
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