The Lotus Carlton (in mainland Europe, the Lotus Omega) was a Vauxhall Carlton saloon upgraded by Lotus Cars to be a 177 mph (285 km/h) sports car. Like all Lotus vehicles, it was given a type designation — Type 104 in this case. The external differences were minimal to the five seater with only the rear spoiler, air intakes on the bonnet, Lotus badges on the front wings and bootlid, and considerably wider wheel arches telling it apart from any other Carlton. The car was only sold in one colour, a shade of British racing green called Imperial Green, a very dark green that in anything but direct light appears black. Lotus' modifications included an upgraded engine, which was stroked (the bore remained the same as the original block) from the standard Vauxhall 2969 cc 24v straight six unit, used in the GSi, to a capacity of 3615 cc. Lotus then added twin Garrett T25 turbochargers and an intercooler to give 377 hp (281 kW). A six-speed manual ZF transmission from a Chevrolet Corvette ZR-1 was used to transfer this power to the rear wheels. The car was capable of 0-60 mph in 5.2 seconds and had 12.5 in (330 mm) AP ventilated disc brakes with racing calipers all round.