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yay for helmholtz resonance; if you have a newer gas car like the 2000 chrysler 3.5l v6(depending on car) it has two runner lengths, ones for high rpm(shorter) and ones for low rpm(longer) the computer switches between the two. it can also be used to tune exhaust. but you also have to match the camshaft to make it easier if it's a single length intake runner.
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