im the same as some of the guys above, i blocked off my bailey vac pipe and had a small blocked of pipe on the intake mani, this gave me the chatter sound which i like, but it takes that bit longer to spool back up when flooring it.
i can understand how this may be bad for the turbo seals as their is then extra pressure comming in the opposite direction that its used to as the blades chop the air so to speak, but ive not had any issues running like this.
i changed dv again with another baileys and i noticed that with the same setup as above i had a bit of boost leak, maybe the spring on the dv had weakened causing this? i put the dv back on and it boosted fine. ( strangely enough 5 mins later i blew a boost pipe of the IC) but thas another story.
Some like it, some hate it! I LOVE IT!