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i bet it will be slightly quieter because there is packing in the prochamber and the prochambers usually mellow out the sound. but its slp lm1's...how could they ever be quiet???
Mac LT, Mac Off road Pro chambered H, SLP loud mouth 1. I have a clip of me revving it to 3500 rpm, its loud *** hell. Off road X is louder execpt at certain rpms, which is only 3000 and 4500.