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Exhaust header: help or hurt f/e
A while back when i was into quicker acceleration i installed an exhaust header (4-1 style) in place of the stock manifold. Since hypermiling i almost never exceed 2500rpms, so clearly i don't care how fast my car accelerates now. There's a person with a Corolla who is willing to buy my header and give me his stock manifold. Do u guys think the header helps or hurts f/e, and should i do the swap?
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