Sigma II, with the CTS-V receiving a supercharged LSA V8 (a variant of the Corvette ZR1 engine). Sigma II became exclusive to the CTS, as the SRX was downsized for 2010, adopting the Theta Premium architecture and the STS was retired after 2011 (the SLS, 2013) with no direct successor. For 2011, coupé and station wagon variants were introduced on the Sigma II platform (marking the first Cadillac coupe with a rear seat since the 2002 Eldorado) Applications: 2008–2013 Cadillac CTS 2009–2015 Cadillac CTS-V References Sigma