to be honest id say thats an opinion and not fact. mines chattered from day one no BOV or dumping just 100% pure chatter and my turbos as strong as ever. its a common misconception that chattering is bad for your turbo @theminiguru- try putting your foot down a bit, getting the turbo to spool up then instead of lifting the clutch to get it to dump, try lifting off a lot slower gently feed the pedal in and it should chatter. will take a bit of practice on how slow etc to do it but my blitz suoer sound BOC used to chatter all day long doing this Quick lift of clutch=Dump slow release of clutch= Chatter