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Originally posted by JAM1775 I am sure a 3" straight tube flows more than a 2-2.5" tube....
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Surprisingly, (at least to me) this isn't always true. At times, particularly during lower RPM states, having too large a diameter can actually decrease the flow. It has to do with allowing the gases to cool and stagnate potentially increasing the backpressure. There's an interesting article about it here:
http://www.burnsstainless.com/TechAr...ry/theory.html