i just wondered whether there was a physical reason why its better to change it rather wait until it fails.
....It's a preventative measure - If the stock DV fails and you don't replace it fairly promptly I understand (though stand to be corrected) that it could cause damage to the rather more expensive turbo. Don't ask me how cos I don't know.
It's more likely to happen on a remapped car because of the increased boost levels.
Although VW dealers in most of Europe will be good, it's peace of mind if you are going on a long journey abroad.
I did mine purely as preventative maintenance and because my turbo charge and discharge pipes were being upgraded anyway. I've got the Forge DV and they've recently updated mine FOC.
No, my 05-plate 06-build K03 GTI has never made whooshy noises - Just some 'airy' breathing sounds mixed in with the Milltek.