Well wheelweights.net lists no 17" SSW rims under 8.2 kg and quite a number over 9kg.Hardly feather-weight.
I think fitting them to your Passat is a dumb-f*ck idea.£10 says they must weigh 10-15kg, so they'll junk the any handling that might still be lying about. You'll split the sidewalls on the cr@p tyres on any corrugation you find in the road and the limp-wristed 115bhp lump in the front will have trouble rotating them in the first place, as they look like they'll have a higher rolling radius than the current wheels.Have you bought them yet then?Unsprung weight ALWAYS matters.
shep, if i can geta mk3 gti box fitted, then i AM considering track days