i have a uk turbo 2000, i was also into my my vag until recently, the wife still has a mk4 golf, i have a good friend from mossley he now lives just on the boarder in stalybridge, he was into his vag also and has since bought a bmw and a focus st
mods wise a decat is a good option to free the gasses, a version 4 can be mapped iirc, if you check the turbo if it's a wrx i believe they used the td05 unit whereas the uk 2000's used the o4, the o4 is good for about 300bhp whereas the 05 is about 450, andrew carr is a well know mapper, he does a live map to suit your driving, he takes you out with him in the passenger seats and gives you instructions and you give him the feedback untill your happy with the way it go's, also most parts can be bought from a subie specialist not too far from me called cams
Cams
Brian Coward
01254 689 994
07931 211 871
Unit 12
Brook Mill Complex
Branch Road
Blackburn
BB3 0PR