I have a universal think its the same as kells', though instead of cutting the bumper I cut the fan mounting so I could move the whole rad and fan setup back an inch or so.
You can also use this method to fit an fmic with the AC compressor and not have to cut the bumper, but it requires a lot of cutting of other parts.
tshirt2k has pics of how he did it in his build thread on clubgti, he has an ABF turbo running AC