R0ach - I have a MK2 172 and am beginning to go down this modding route too. I only think a few parts that are made for the MK1 actually fit the MK2.
I am positive that a set of Tarox G88 front discs will fit on both MK1 and MK2.
Suspension wise Im not sure. Eibach make a set of 30mm lowering springs (which Im getting next week) which maybe for the MK1 but do fit a MK2.
Induction kits/air filters must be specifically for a MK2 as the filter box is different on a MK2; redesigned because of the hot water pipe issue on the MK1. I am going to get a BMC replacement air filter, probably next week too, and as far as I know is the only filter avaliable on the market.
Exhausts are possibly different between LATE MK1 and MK2, not too sure but I am going to get a custom Hayward and Scott system when I can afford it! There were differences between the early and late MK1 models, as some people discovered when putting Magnex systems on.
Chipping cannot be done on a MK2 yet as it has a drive-by-wire system i.e. no cable attaching it to the engine! If you look above the accelerator pedal (when you get it) you will see a connector with lots of wires attached which is fed directly into the ECU.
Bodykits are low on the ground at the moment but Im sure this will get more as the car gets older. Unless you want to get a custom one made!
Hope this helps you out a bit!
Geoff
