| engine type | Original performance | Performance after tuning | Vmax | More efficient | price |
|---|---|---|---|---|---|
| 840i CI 4.0 | 210 kW (286 hp) 400Nm | 225 kW (306 hp) 440Nm | * | 20 hp | 449€ |
| 840i CI 4.4 | 210 kW (286 hp) 440Nm | 225 kW (306 hp) 465Nm | * | 20 hp | 449€ |
| 850Ci E31 | 240 kW (326 hp) 490Nm | 265 kW (360 hp) 530Nm | * | 34 hp | 549€ |
| 850 CSI | 279 kW (379 hp) 550Nm | 303 kW (412 hp) 590Nm | * | 33 hp | 599€ |
| 850 CSI | 306 kW (416 hp) 570Nm | 326 kW (444 hp) 595Nm | * | 28 hp | 599€ |
| 850i E31 | 221 kW (301 hp) 450Nm | 237 kW (322 hp) 480Nm | * | 21 hp | 549€ |