A year after XLR-V launch and two after CTS-V, in 2006, Cadillac started producing STS-V sedan that also featured the famous Northstar V8 engine from XLR-V. However, the supercharged 4 litres Northstar V8 in STS-V had 26 more horsepower and 25 more lb-ft of torque than XLR-V's.