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ORIGINAL: ARdoller
well most race engines are carburated, but thats besides the point[8D]
the 4cyl mustang after 1985 was efi, and that car needed all the backpressure it could get
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What the hell does that have to do with back pressure? It's not the induction system that's affected it's the cylinders and they need a certain amount of scavenging to make power and if you have too much free flow you lose low end power.