How much power gains from port and polished head and intake manifold?
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Would you recommend getting a RS4 Intake Manifold instead of a port and polish job on the stock intake mani.? I know Roughedgez has done it with great feedback on it. TIA
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RS4 intake plumbing will give more high end hp, but will actually give you less low-end torque due to the fact that from a standstill, a larger volume of air must "fill" into the intake plumbing before an equilibrium is reached. For U.S. driving, not worth the verylarge amounts of $$$$ required. It's basically a mod for mod's sake unless you are doing some serious track time.