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Also..I think he meant "shorter" and taller high freq sounds and wave lengths (I study some sound engineering) gets killed with the cat. That's why you can still get a bassy exhaust with a catted setup (the cat still lets longer and low freq sound to pass through; but kills short, spikey, high freqs... ie: rasp). Remove the cat..and now it's letting both the super spikey high freq wave lengths (rasp), as well as the longer bass wavelengths, to pass through.
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