Yeah i saw that japanese test back from 1999 but nobody knew who actually did it, and untill i see a turbo thats been damaged by a blitz sus i will still use them, my first R came with one fitted and i ran 2bar through it, must have been on the car a few years before i got it, plus the good few months i gave it death and the blades are perfect, plus i got a few mates using them with no problems whatsoever. Seen blade damage from using the hks mushroom so i'd never use one of those but thats it, you got first-hand experience of a blitz filter damaging a turbo ? It might not be everybody's first choice of filter but unless you've actually seen one damage a turbo it's not worth him buying something that he's already got because a few people heard a few people say it's shit.