CSR, was as a 6 series of Caterham, was launched in 2005 after spending significant time on developing improved Seven. Car had something common with SV model, but it received more solid chassis, and improved suspensions. CSR was also released as a 7-th series in 2007 of Caterham with two trim levels and tuned 2.3 L Ford Duratec engines that generated power of 203 hp (149 kW) or 264 hp (194 kW).