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God I wish I still had my notes for Street legal performance and hotrod, here do this trick, get a piece of paper and put it against ur muffler tip, its gonna suck it against it showing you that there is backpressure even if its a little bit weither it be a 4, 6...16 cylinder whatever. Theres 3 cycles to an exhaust system giving you that pulse... now ur gonna make me look up my effin notes lol.
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