S4 2000-2005 ... 916 motor slightly retuned for a bit more mid-range power (like it neded it!!) in an ST4 chassis. Call this the base model
S4R 2003 on ... Cosmetic update to single side swining arm, exhausts stacked on one side. Motor changes to the 996
S4RS 2006 on ... More upgrades to suspension, now adjustable ohlins, motor changes to Testastretta unit so it was still a step above the 1000DS model.
There are some S4S challenge models floating about which were used for the single class race series. You'll know these as the steering is lots faster than standard, usually the side panel had a hole to adjust the rear shock through and everything is/was lockwired.
Expect about about 100bhp at the rear wheel from all of these depending on mods, in the light naked monster package that = fun but the fuel consumption can be a bit high
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"The final measure of any rider's skill is the inverse ratio of his preferred Traveling Speed to the number of bad scars on his body." Song of the sausage creature
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