There have been loads of questions around fitting a K04 to the A4 2.0TFSi on this forum so I thought i'd have a crack at it and post up my progress.
Parts list so far :-
K04 Hybrid Turbo
ATP Front Mounted Intercooler
Custom RAI Motorsports 4" to 3" Down pipe with s3 flange
Custom made Silcone T pipe (38mm take off to fit s3 flange)
500cm 25mm id silcone hose
S3 Diverter Valve flange (06F-145-751)
034 Motorsports Silicone Turbo hose
With regards to fitting the actual turbo I was told that one of the ears on the hotside flange fowls the motor mount and will need to be trimmed. You can get away with grinding it slightly i'm told but I went down the route of totally trimming the ear back and re-tapping the hole. I also trimmed down the flange on the downpipe to match.