LIKE all 911s before it, the C4S employs a rear-mounted longitudinal flat six that drives the rear wheels via a rear transaxle. Unlike the majority of Porsches, however, C4S employs the flagship Turbo model's viscous coupled four-wheel drivetrain as standard, making this Australia's only four-wheel drive Porsche, apart from the Turbo. Feeding a constant five per cent of engine torque to the front wheels in normal (read: straight-line) conditions, rising to as much as 40 per cent, the C4S maintains Porsche's trademark rear-wheel drive characteristics even in the slipperiest of circumstances. Of course, the Porsche Stability Management (PSM) system keeps everything in check.