i have a pmi 1.1ltr bottle just over a year old with a blue reg on but i believe its high pressure. there was a thread a while ago about this. cant remember what the thread was called or where it was posted but there was one :X
bottle is in test until 08/2011 it has been used on a dm7, i was always under the impression that blue pmi regs are lp red are hp, am awaiting confirmation of this