Just installed it yesterday, Euro + K&N. Sound and power levels seem the same (minor, minor tone change), but the response is improved and seems to rev happier.
As an experiment I tried to see how it sounded with the top cover removed (the ram air effect from the factory ducting still "contributes" air toward the filter) to see if the sound changed, and it had a flat/echo-like tone that I did not like. Cover went back on, keeping it Euro-stock + for now!
Rob
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