Re: exhaust back pressure/discuss...

GET REALIZED! BE HERE NOW! /
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It isn't really back pressure. It's flow. When the exhaust volume is low at slower rpm and you have a real open exhaust, the gas just goes into exhaust cools a bit expands and slows down, so the next pulse hits this cool gas and slows down too. Until rpm is high enough to keep hot gas moving through the exhaust having a real open system is going to hurt performance.

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