XLR |
||||||
| Year | Engine | Original Power | Stage 1 | Difference | Vmax | ECU |
| 2006-2009 | 4.4L | 469 Hp 439 ft·lb | 500 Hp 480 ft·lb | 31 Hp | ✓* | E67 |
| 2006-2009 | 4.6L | 320 Hp 315 ft·lb | 355 Hp 340 ft·lb | 25 Hp | ✓* | E67 |
*Depends on the software version
XLR |
||||||
| Year | Engine | Original Power | Stage 1 | Difference | Vmax | ECU |
| 2006-2009 | 4.4L | 469 Hp 439 ft·lb | 500 Hp 480 ft·lb | 31 Hp | ✓* | E67 |
| 2006-2009 | 4.6L | 320 Hp 315 ft·lb | 355 Hp 340 ft·lb | 25 Hp | ✓* | E67 |
*Depends on the software version