It's far from that simple I'm afraid. The S2 has ABS style hubs, the early, pre late 86 cars don't. So for the front you'll need wishbones, struts, hubs, spindles, callipers, discs & different hoses. The back end will need all the S2 bits, trailing arms, hubs, discs & callipers, different brake pipes, backing plates & possibly different half shaft ends. Oh & you'll need late wheels (all 5) for all 4 corners as the offset is completely different & 15" wheels don't go over S2 callipers.

Physically fitting them isnt a particilarly big job (actually its someone elses job as youll need an adapter), but making them work properly can be a little more complicated. Early cars werent fitted with a brake effort limited where as later ones were. For a track car you can retain the original master cylinder and fit a bias valve, but that might not be suitable for your application.

Going to check all my discs and pads and change the brake fluid. Should make a reasonable difference. Esp as I keep driving around with the damn handbrake on. Rlly need to get that parking light fixed, damn you 944 you have too much torque.

Mine runs early S2 calliper all round but a standard late 2.5 Lux m/cylinder & I've had no problems with brake locking etc.
AFAIK you can't run an adapter on the early cars as there simply isn't the space for the 4 pots, incorrect disc size & offsets etc. hence needing spindles etc.

so if you use standard non S2 front legs, '86 on you need to fit the calliper brackets, but nothing else is needed, just bolt the S2 calipers on and bleed the brakes ?

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Mine runs early S2 calliper all round but a standard late 2.5 Lux m/cylinder & I've had no problems with brake locking etc.
AFAIK you can't run an adapter on the early cars as there simply isn't the space for the 4 pots, incorrect disc size & offsets etc. hence needing spindles etc.