wheel with triangular centre; cloth seat centres became available as an option to the standard full leather. Available options included metallic paint, a deep front spoiler, air conditioning, wider, 16-inch Speedline wheels with Pirelli P7 tyres, and a satin black roof aerofoil (standard on Japanese market models). Apart from the DOHC 32-valve cylinder heads, the V8 engine was essentially of the same design as that used in the 308 GTSi model. Total displacement was , with a bore x stroke of . Output on European specification cars was at 7000 rpm and at 5000 rpm of torque, while for US specification variants were SAE net at 6800 rpm and at 5500 rpm of torque. The gear and final drive ratios were altered to suit the revised characteristics of the four valves per cylinder engine. One other significant benefit of the QV's four valve heads was the replacement of the non-QV models sodium valves which have been known to fail at the joint between the head and the stem. Bosch K-Jetronic fuel injection and Magneti Marelli Digiplex electronic ignition were carried over from the GTBi/GTSi. All US market examples were fitted with catalytic converters. The 288 GTO introduced in 1984 is considered as the first Ferrari supercar. The 288 borrowed much of the styling from the European 308 GTB QV of the previous year, 1983: it is also powered by a similar 2.8-litre V8 with a smaller bore and twin turbochargers, it retained the general bodywork lines with extended wheelarches, different side air vents, and bigger rear spoiler, longer () wheelbase, and the central tubular space frame chassis. In 1985 Ferrari launched the 328, which replaced the Quattrovalvole. Between 1982 and 1985 the quattrovalvole was produced in a total of 3042 GTS and only 748 GTB examples. 208 GTB/GTS In 1980 Ferrari introduced a two-litre version of the 308, 208 GTB and 208 GTS. They were mainly for the domestic Italian market, where new cars with engines above 2 litres were subjected to a much higher value added tax, 38% instead of the standard 18%. The 208 was also listed in Portugal and New Zealand. The 208 GTB/GTS replaced the 208 GT4 2+2. It is often regarded as the slowest Ferrari ever made but proved faster than the 208 GT4 Bertone in a 1980 test by American magazine Motor Trend. The engine was de-bored to 66.8 mm (giving it an undersquare