The 2003 and 2004 models used General Motors Vortec 5300 engine a 5 3 L 300 hp V8 Performance while impressive was not spectacular at 7 7 s to 60 mph with a 15 9 s 86 4 mph quarter mile run The 2005 SSR used the 390 hp LS2 V8 also found in the 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 395 hp automatic transmission and 400 hp manual transmission respectively
