The longer they are the quieter they are, and in my experience the longer they are the more they remove the higher notes leaving low mellow tones. I don't like the high cackle and always run long mufflers or glass packs. My brother bought a Beretta with somebody’s version of ‘fast and furious‘ exhaust and replaced it with the longest glass pack he could find. You could hardly hear the car run at idle, but if you stood right next to it you could
feel the low notes and it always made people wonder what was under the hood. My brother said ‘it’s easier to avoid the cops with a silencer on your Beretta’.
