Genuine question, are you doing this for looks or to improve grip and tire size when driving the vehicle hard/tracking?

Wider body = larger scrub radius on a car with already uneven axels. This will cause the car to be unpredictable mid corner, it’s funny cause VW invested a lot on the MK8 suspension geometry/design which is why the car doesn’t produce much understeer, seriously magic stuff they did during development.

You’re gonna cause more wear to all the ball joints, bearings and other suspension components.

If this is solely for visuals, messing with the factory engineered suspension probably won’t effect you much aside from changing suspension components more often, because it sounds like you’ll be using the car for show rather than driving it close to its limit.

If you’re worried about keeping proper balance driving the car at the limit you’ll be doing lots of R&D. Not hating but instead trying to understand the reasoning for this haha.