I'm no expert but I'm sure people have fitted R8 and TTRS brakes. Might not be a straight fit though. Why don't you want R32 brakes or equivalent?
DaveB is the man to ask for advice
It's not a case that I don't won't the R32 set up as I'm sure it provides ample amounts of stopping power over the standard GTI set up, I just fancy something a little different perhaps? Plus when I've found a pair or complete R32/S3 set up they seem to be priced like there made from gold with added VW tax because people know you can bolt them on to different models as an OEM+ upgrade. I figured for the same money I could get something that isn't so common and that little bit different.
An example was a few weeks back on eBay, a breaker who had a burnt out R32 wanted £1,200 for the fronts & rears with discs & pads. There not £1,200 brakes surely!? My 4 pot porkers only set me back £375.
Would the front R32's suffice on there own or is it understood that rears get done also?