were in GM's "signalgelb" sunflower yellow, and had large black stripes on the side, where a sign said "Turbomanta". The downside to this was fuel consumption. The turbocharger had halved the economy of the car, and building it was also costly. Therefore, Opel closed the project, leaving the five cars as the total production number. However a British engineer at the Dealer Opel Team (D.O.T.), which was the British importer and builder of Opel cars in Britain, was so enthusiastic about the cars that he had D.O.T. build an additional 28 cars. The cars were all based on the 1974 luxury Berlinetta model, with full gauge packs, automatic transmissions, and alloy wheels. All 28 cars were black with vinyl roofing. The only thing identifying that the car was indeed a Turbomanta was a small sign at the rear quarter of the rear wings saying "turbo". Very few of these cars still remain today. TE 2800 The TE2800 was a totally different project that Opel refused to endorse. A Belgian company called Transeurop Engineering also wanted to increase the engine power of the Manta A and installed the 2.8-litre CIH inline-six from the Commodore in a Manta in 1971. Transeurop entered the car in the 1971 Tour of Belgium (part of the European Rally Championship; driver Chris Tuerlinx finished in seventh place). Opel had also tried the six-cylinder engine layout in 1971 and 1972 but with no success. The cars were deemed too expensive to build, and the market was overwhelmed at the time with big-engine cars. Transeurop Engineering did not agree, and a Commodore 2.8GS engine was fitted into the engine bay of the Manta 1.9SR. The radiator, the bonnet, the front engine supports and part of the front section, the rear axle, and the transmission all needed to be changed. Transeurop Engineering turned to Opel's best tuner of the time, Steinmetz, who supplied a new fibreglass bonnet with a large bulge on it to make room for the engine, a set of widened arches, and a special front bumper integrated with the lower front spoiler, all to make room for the changes that needed to be made to the car's front end construction. Much of the front was cut out and replaced with other parts being mounted further to the ground in order to give room for the radiator. A closed radiator system was installed so that the radiator