| engine type | Original performance | Performance after tuning | Vmax | More efficient | price |
|---|---|---|---|---|---|
| SLK 200 | 100 kW (136 hp) 190Nm | 111 kW (151 hp) 210Nm | * | 15 hp | 420 |
| SLK 200 | 120 kW (163 hp) 230Nm | 143 kW (195 hp) 280Nm | * | 32 hp | 420 |
| SLK 230 K. | 142 kW (193 hp) 280Nm | 158 kW (215 hp) 315Nm | * | 22 hp | 420 |
| SLK 230 K. St.2 | 142 KW (193 hp) 280Nm | 174 KW (237 hp) 345Nm | * | 44 hp | 420 |
| SLK 230 K. | 145 kW (197 hp) 280Nm | 157 kW (214 hp) 310Nm | * | 17 hp | 420 |
| SLK 230 K. St.2 | 145 KW (197 hp) 280Nm | 171 KW (232 hp) 332Nm | * | 35 hp | 420 |
| SLK 32AMG | 260 kW (354 hp) 450Nm | 290 kW (395 hp) 510Nm | * | 41 hp | 420 |
| SLK 320 | 165 kW (224 hp) 310Nm | 178 kW (242 hp) 340Nm | * | 18 hp | 420 |
| SLK 320 | 165 kW (218 hp) 310Nm | 174 kW (237 hp) 335Nm | * | 19 hp | 420 |