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Originally Posted by Bisimoto
Very true, Blue. You can also enhance that with pipe ID steps, and preventing reversion at the flange helps a bunch as well. Despite what I see in the market for the boxsters, a long primary tube may prove to be a best bet due to the relatively low peak power RPM of the boxster engine. Most units I design for 9800+ rpm engines have primary lengths that hover in the 20 inch range.
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Do you do any modeling with software tools? Wave, GT-Power? You can get close to optimal much faster with some well designed models.