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as exhaust gasses cool. they slow down .. creating a wall of slower air that is constantly getting interuppted by fresh burn. creating a back pressure...
path of least resistance up to a point of muffling is the ideal situation for performance and some 'back pressure'. constricting too soon can lead to poor exhaust velocity and slow down the effiency of the process. tuned exhaust give more power
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I know something. But I forgot it. Thought I should tell you. So you're not so surprised later on.
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