As well as sports car manufacture, the company also acts as an engineering consultancy, providing engineering development—particularly of suspensions- for other car manufacturers. Lotus's powertrain department is responsible for the design and development of the 4-cylinder Ecotec engine found in many of GM's Vauxhall, Opel, Saab, Chevrolet and Saturn cars. The US Lotus Elise and Exige models used the 1.8L VVTL-i I4 from Toyota's late Celica GT-S and the Matrix XRS both of which are no longer available new. The new Exige has the same V6 engine as its bigger counterpart the Evora and is not available in the US as a road-legal vehicle.