poo poo pipe = louder, ive hered numerous stories as i looked into buying one. (and still would like one) however, the SBP performance pipe has a muffler attachment to quiet it down and gives you some added performance. i find tuned pipes to always sound nicer.
intake noise is RETARDED loud, if you make yourself a silencer for it you might be satisfied with just that.
hopefully that can steer you towards m-bliss! lol