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I like the mishimoto one because it retains the resonator chamber. They did multiple dyno runs with and without it and found it adds a few hp above 7000 rpm. From what I’ve seen, resonator chambers aren’t there for sound but rather to help reduce the slowing of intake air velocity from resonance or reversion. Not sure if that’s true or not but since they had the dyno sheets to show it, I figure why not.
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