Hi Patch,
I'm very keen on good handling, carwise its the most important thing to me.
Here's my instructions for optimising a mk3gti for fast road use...
Keep your wheels 15s or 16s - get whatever is lightest, i use vr6 bbs rims as they are lighter than the standard gti ones, plus they are dirt cheap 2nd hand. If 15"s i find 32psi front/29psi rear works best.
Change the bushes, especially the rear beam bushes (about £120 fitted), they go off after about 40k miles, so yours will almost definitely be knackered. poly or standard rubber ones, it makes little difference. Fronts are nice to do too, although the rears are almost always in worse condition on older mk3s.
Buy a suspension kit from a respectable company. My koni kit is great and was only £380. 40mm lower all round, top adjustable at the front. I keep it at about 50%. Check your top mounts, if they are even a little bit split or out of shape, get fresh ones. There's no point getting the suspension sorted if you are gonna use crappy top mounts.
Then AFTER all that, get the camber at the front set to 1degree negative and the rears set to 0.5deg neg.
Then do the tracking and keep it neutral, if anything maybe a tiny hint out toe out at the front.
Thats it. It should handle better than any mk3 gti ever did from the showroom,
providing your chassis & suspension components are all straight etc.
