Muchos £££
310x28mm discs, 4 pot radial mount calipers, 2-piece grooved discs with anodised ali bells, Ferodo DS2500 pads and braided lines (made up for a MK2 Golf GTI) came to £1080
You pay a price to keep the standard wheels! The Wilwoods were another option but I've not heard many good things about the Superlites which seem to flex too much.