STS

Year Engine Original Power Stage 1 Difference Vmax ECU
2005-2007 3.6L 255 Hp 255 ft·lb 280 Hp 280 ft·lb 25 Hp   E55
2006-2010 4.4L 469 Hp 439 ft·lb 500 Hp 480 ft·lb 31 Hp ✓* E67
2006-2010 4.6L 320 Hp 315 ft·lb 355 Hp 340 ft·lb 25 Hp ✓* E67
2008-2009 3.6L 302 Hp 272 ft·lb 325 Hp 295 ft·lb 23 Hp E69

*Depends on the software version