of shorter final drive gear) and achieved a acceleration time of 5.5 seconds and a quarter-mile time of 13.9 seconds at . Top speed was factory rated at . The 944 Turbo S' suspension had the "M030" option consisting of Koni adjustable shocks at the front and rear, with ride height adjusting threaded collars on the front struts, progressive rate springs, larger hollow rear anti-roll/torsion bars, harder durometer suspension bushings, larger hollow anti-roll/torsion bars at the front, and chassis stiffening brackets in the front frame rails. The air conditioning dryer lines were routed so as to clear the front frame brace on the driver's side. The 944 Turbo S wheels, known as the Club Sport design, were 16-inch Fuchs forged and flat-dished, similar to the Design 90 wheel. Wheel widths were at the front, and at the rear with a offset; sizes of the Z-rated tyres were 225/50 in the front and 245/45 in the rear. The front and rear fender edges were rolled to accommodate the larger wheels. The manual transmission (case code designation: AOR) featured a higher friction clutch disc setup, an external cooler, and a limited-slip differential with a 40% lockup setting. The Turbo S' front brakes were borrowed from the 928 S4, with larger Brembo GT 4-piston fixed calipers and 12-inch discs; rear Brembo brakes remained the same as a standard Turbo. ABS also came standard. The 944 Turbo S' interior featured power seats for both driver and passenger, where the majority of the factory-built Turbo S models sported a "Burgundy plaid" (Silver Rose edition) interior colour but other interior/exterior colours were available. A 10-speaker sound system and equalizer + amp was a common option with the Turbo S and S/SE prototypes. Only the earlier 1986, prototypes featured a "special wishes custom interior" options package. In 1989 and later production years, the 'S' designation was dropped from the 944 Turbo S, and all of the turbocharged iterations of the 944 featured the Turbo S enhancements as standard, however the "M030" suspension and the Club Sport wheels were not part of that standard. The 944 Turbo S was the fastest production four cylinder car of its time. 944 S For the 1987 model year, the 944 S (the S being the abbreviation of Super) was introduced. The 944 S featured a high performance naturally aspirated, dual-overhead-cam 16-valve version of the 2.5 L engine (M44/40) featuring a self-adjusting