erm. mk4? the usual mods. the same youd do to any mk2. say weitec springs, dampers and arb's. poly bush everything. and you have a good handling car. k03s and a map and exhaust and your away! ever driven a sorted mk4?
iv seen a few good mk4's for going for 2k
car 2k
service kit 150
weitec sus+arb 550
polys 150
k03s 200
r-tech map 250
total 3300
a 200hp good handling, good looking oem+ car. no, not massively exciting, but very compitent. i often perv the mk4 section. some very focused cars in there.
however, no-one can say a mapped aug with a k03s in a mk2 isnt exciting. not with that turn of speed blasting through the right ratios