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Just to amplify ZS's point, when at highway speed note how much noise you are hearing...then open the throttle suddenly. The noise increases immediately. The engine rpm is not changing nearly as fast as the noise level. That tells me that the noise is not exhaust note but intake. It was much more evident on my RX3 than the RX4. My RX3 is long gone but had I kept it I was planning to experiment with some kind of sound mitigation inside that small airbox.
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