The third generation Audi 100 launched in September 1982 with aerodynamic styling, contrasting the boxy styling of its predecessor, and offering a much improved drag coefficient, 0.30 on base model. The aerodynamic C3 bodywork featured pin-mounted flush windows, offering a key reduction in aerodynamic drag. Altogether, the aerodynamic body increased the fuel efficiency and top speed versus other cars of similar engine size.[31] The C3 introduced Audi's proprietary restraint system, marketed as procon-ten. Two-door models were no longer offered, and the Audi 100 Avant was now positioned as a station wagon rather than a hatchback - the Avant designation would be used for all Audi station wagons from that point forward. The Avant featured an available extra folding third row seat — not available in conjunction with ABS-brakes as the brake control unit sat in the same space.[32] The 200, launched in 1983 continued as the upmarket variant with several versions of the 2.2 L turbo 5-cylinder available in different markets over its life ranging in power outputs from 165 PS (121 kW) MC engine, through the 200 PS (147 kW) versions to the final 220 PS (162 kW) 20-valve 3B engine available from 1991. The 1983 Audi 200 Turbo had a top speed of 139 mph (224 km/h).[33] The MC turbo engine was available in the 100 as well for some markets.