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Originally Posted by BonzoHansen
“…so I see no benefit in running 3 inch halfway to the back and switching to a larger pipe…”. I think you are right – the exhaust gasses cool as they flow down the system – becoming less dense. So I see no benefit in larger down stream pipes. I bet slightly smaller pipes would have zero impact.
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thats not quite true. when something cools off, it becomes more dense because the molecules slow down and and have to be closer to eachother to stay bonded. However that also means it contracts effectively taking up less room.