<Tr> <Th_colspan="2"> Chronology </Th> </Tr> <Tr> <Th> Predecessor </Th> <Td> Saleen S7 </Td> </Tr> <P> The Saleen S7 Twin Turbo is an updated version of the original S7 . Although the initial concept for the S7 incorporated twin - turbochargers, they were not used on the production car . </P> <P> The engine is upgraded with two Garrett turbochargers producing 5.5 psi (0.4 bar) of boost, increasing the maximum power to 750 hp (559 kW; 760 PS) at 6,300 rpm, and the maximum torque to 700 lb ft (949 N m) at 4,800 rpm . The front and rear diffusers and the rear spoiler were also reworked to increase downforce by 60% . </P>

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