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The statements that "back pressure is good" or "an open exhaust is best" are nonsense. To break any theory you take it to the extreme. So if i run 1/2" exhaust pipe i should see an increase in efficiency? How about i just remove the exhaust entirely including the manifolds, will that increase power?
Its been said already, but a PROPERLY SIZED exhaust is what is important. Pressure is only used to suppress noise, notice how many new cars at idle have a, for lack of a better term, throaty exhaust at idle then gets quiet as they accelerate?
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