Calm Down, Calm Down, Calm Down now lads(Liverpool FC Supporter).
Ok I have a PiperCross induction kit fitted to my Digifant.  I can't compare it to another induction kit coz I brought the car with it on but it does make a decent noise.......its not a subtle noise but its not an annoying load sound either.  Decent tone and roar to it.  The induction kit is supposed to give u some xtra bhp(probably)....