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Someone once did a semi-scientific study of this on the Insight, climbing a hill repeatedly with and without the resonator. Removing the resonator reduces horsepower at any given throttle angle between 1000-1500RPM, but has no discernable impact on engine efficiency.
I tell you what, though, once I removed mine, I could hear the engine better. It's hard to tell what the engine is up to when you can barely hear it.
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