The S1 has the cream gauges with speedo & revcounter ahead of the driver, and the Getrag box. The S1 also has the tombstone head restraints.
The S2 goes back to the traditional dash with speedo and revcounter in the centre of the dash. The intake system looks very different to the S1!
The S3 has the wider front frame so wider front track, and so is less of a lozenge shape.
The S3 has a new engine map. It is recognizable by lifting the front covers. The exhaust manifold tubes meet under the fender while on the S2 the exhaust manifold tubes meet in the engine compartment.
