the ET will be stamped onto the inside of the wheel....
e.g.
remember the extra profile on the tyres is actually LIFTING the car up.... so you'll have to drop it about 10mm just to get it back where you started... which will make it VERY difficult to go for that low, sporty look if you're actually starting with the car too high.... even if you get adjustable coilies, you're still going to runinto arch rubbing probs a lot sooner than most people here...
what the rest of the guys have been saying also applies (it will increase gearing, reduce acceleration, but increase the top speed in each gear, plus it will offset your speedo and odometer) - we've pretty much all been there, done that, tried to cut the corners and learned a few lessons.... you're welcome to take the advice or learn the lessons for yourself... and if it's not costing you anything and you're not going to trash the car*, then you're welcome to have a play and try out those wheels.
*you're unlikely to trash the arches with standard height suspension, just provided you don't try track daying it with a higher centre of gravity!
One concern: you have got VW spec wheels? 57mm hub and the correct bolt pattern?
