The 2003 and 2004 models used General Motors' Vortec 5300engine, a 5.3L 300hpV8. Performance was 7.7s to 60mph (97km/h) with a 15.9s/86.4mph quarter mile run. The 2005 SSR used the 390hp (291kW)LS2V8 also found in the C6 Corvette and Pontiac GTO, and also offered a manual transmission (the six-speed Tremec) for the first time, as an option. For the 2006 model year, the LS2 engine featured minor modifications that boosted its output to 395hp (automatic transmission) and 400hp (manual transmission), respectively. In addition, GM badges were added to the vehicle.