Milltek all the way!!!!
Best decat and exhaust available for the RS with plenty of power gains!
There are some good deals on them at the moment - checkout this forum.
WWW.FRSOCC.COM/Forum
We are nearly all RS owners on there and lots of talk about parts and good club deals also.
Lot of guy's run the Gen II K&N which is good - haven't done mine with that yet.
Also Bluefin is a must!! Transforms the car completely!
Hope this helps!