In 2004 the first Boxer model to be fitted with the modified engine – expanded to 1200 cc – was launched: the BMW R 1200 GS. The engine’s torque and output both saw increases, the GS models now developing 100 hp, the RT and ST 110 hp, and the S a lofty 122 hp. The useable rev band was now significantly wider, the engine sustaining the bullish power it drummed up from low engine speeds. The weight-optimised Paralever shaft drive system, updated single-sided swing arm with characteristic hollow axle and revised Telelever front wheel suspension combined to reduce the unsprung masses. All models have been equipped with a new ABS system during their service life, while 2007 saw the GS and Adventure given a facelift and a power boost to 105 hp.