if youre fitting k04 turbo to that car you will also need manifold,cats and injectors from the s3 and air mass meter i think?is your turbo ko3 or ko3-s?
or...you could fit k04-1 hybrid?makes a bit of differnce,it is the same housing but with slightly modified internals.i fitted one when i had leon cupra and produced about 1.6bar boost