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Originally Posted by emory70
how can freeing up the intake and exhaust not make the engine more efficient? getting more air into and out of the engine is the definition of increased efficiency. no 4 stroke engine needs exhaust backpressure to run properly. the illusion of needed backpressure is just a sign of a poorly tuned exhaust.
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Not looking for a war of words here but you are so wrong. Some high end cars actually have a variable back pressure system to promote better scavaging at different RPM ranges.