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I removed the filter last night and took a test drive. It does seem to rev easier or quicker. I don't think It's much louder, just sounds better. Hard to explain but sounds a bit more "mechanical" sounding or not as muted as before. A little more like past BMWs (to me). I was reluctant at first, took me about 20 minutes of staring at the thing until I finally decided to start cutting.
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