S1 has the Ford ST 220 engine & the Getrag gearbox from a Jag. 230 bhp.
S2 has the Escape engine and lower BHP at 205 plus a transit gearbox. at some stage the power went up to 226BHP.
S3 is the 3.7l engine.
The best is obviously the S1.
Not quite John.
S3 has the upgraded Escape engine.
So far we haven't called the 3.7 the S4.
Perhaps we should........
S1 is the best though.
