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Old 07-20-2010, 08:16 AM   #15
WheelmanSS
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In order to truly impact "backpressure" and how it affects the engine is if you went with piping with the diameter of a coffee can. A half inch to an inch at a time is not going to adversely impact engine cycle.
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Old 07-20-2010, 09:32 AM   #16
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You are not impacting "Backpressure" by oversizing header primaries, you are impacting velocity of the exhaust gasses.
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