May be totally irrelevant to this thread but when I swapped from 31 to a 34 I found my car to be more aggressive when it came on boost.I bought it by mistake tbh.It wasnt untill I tool my 31 off as I realised as it was that.Someone I nearly said Tony wanted about 70 for a used 31 so I got a b/new rebuild able collins 34 for about £60.My 2p worth