R32 calipers are ridiculously heavy. The 2 piece discs aren't too bad, but still heavier than 312s. Some of the weight gain can be offset by fitting Passat bearing carriers and wishbones, and also the driver eating fewer pies
Brake the car appropriate for it's purpose. The amount of crazy disc and caliper combinations I see pop up on the facebook group is nuts, and most of them for sale. Lambo 8 pots, Audi 6 pot ceramics etc etc. It's just nuts. 90% of these combinations are thrown on for kerb appeal and bragging rights, with no thought given to Master cylinder volume, brake bias, rotational mass or wheel clearance. OEMs fit brakes appropriate for the car's mass, performance and tyre width. No Golf running 225 section tyres will even realise the full braking potential of Lamborghini 8 pots and 390mm discs
If it were me, I would go MK7 GTI caliper with TTS 340mm discs, along with the aforementioned Passat alloy items. You'll get the benefit of stronger braking, but without a weight penalty, minimal increase in rotational mass, and more flexible wheel choices.