S1 have racing pedigree and were designed for racing in mind. They were produced in a short production span than the S2 were(The S1 during the later years of the MK3 production) the S2 was produced from the beginning of the MK4 production until the end of the MK4 production.

The S2 was designed for fast 'road' use and with this in mind the suspension etc were designed as such.