Chiptuning Mercedes-Benz R W251 (2005–2013)
15 engines · +22 to +70 hp
R W251: 15 engines — 6 petrol and 9 diesel. The gain is +22 to +70 hp, with up to +136 Nm more torque. GAN GTL from 249 EUR, GAN GT from 399 EUR. GAN GA+ from 199 EUR.
All R W251 engines: exact gains
Standard output, output with GAN, the gain and the price for each box. Diesel and petrol engines are listed separately.
| Engine | STOCK → with GAN | Gain | Tuning boxes and prices | |
|---|---|---|---|---|
| Diesel · 9 engines | ||||
| 350 CDI 4MATIC BlueEF265 hp / 620 Nm | +70 hp+136 Nm |
GTL — 249 EUR · 325 hp GT — 399 EUR · 335 hp |
Select → | |
| 320 CDI224 hp / 510 Nm | +45 hp+107 Nm |
GTL — 249 EUR · 262 hp GT — 399 EUR · 269 hp |
Select → | |
| 320 CDI (US Spec)215 hp / 540 Nm | +45 hp+113 Nm |
GTL — 249 EUR · 254 hp GT — 399 EUR · 260 hp |
Select → | |
| 350 CDI224 hp / 510 Nm | +45 hp+107 Nm |
GTL — 249 EUR · 262 hp GT — 399 EUR · 269 hp |
Select → | |
| 320 CDI211 hp / 540 Nm | +35 hp+122 Nm |
GTL — 249 EUR · 241 hp GT — 399 EUR · 246 hp |
Select → | |
| 350 CDI BlueTEC211 hp / 540 Nm | +35 hp+122 Nm |
GTL — 249 EUR · 241 hp GT — 399 EUR · 246 hp |
Select → | |
| 280 CDI190 hp / 440 Nm | +33 hp+111 Nm |
GTL — 249 EUR · 218 hp GT — 399 EUR · 223 hp |
Select → | |
| 300 CDI190 hp / 440 Nm | +33 hp+111 Nm |
GTL — 249 EUR · 218 hp GT — 399 EUR · 223 hp |
Select → | |
| 300 CDI BlueEF190 hp / 440 Nm | +33 hp+111 Nm |
GTL — 249 EUR · 218 hp GT — 399 EUR · 223 hp |
Select → | |
| Petrol · 6 engines | ||||
| 400333 hp / 480 Nm | +57 hp+82 Nm |
GTL — 279 EUR · 380 hp GT — 459 EUR · 390 hp |
Select → | |
| 320272 hp / 400 Nm | +46 hp+68 Nm |
GTL — 249 EUR · 310 hp GT — 399 EUR · 318 hp |
Select → | |
| 500388 hp / 530 Nm | +31 hp+42 Nm |
GA — 219 EUR · 419 hp GA+ — 219 EUR · 419 hp |
Select → | |
| 280231 hp / 300 Nm | +28 hp+36 Nm |
GA — 199 EUR · 259 hp GA+ — 199 EUR · 259 hp |
Select → | |
| 500306 hp / 460 Nm | +24 hp+37 Nm |
GA — 219 EUR · 330 hp GA+ — 219 EUR · 330 hp |
Select → | |
| 350272 hp / 350 Nm | +22 hp+28 Nm |
GA — 199 EUR · 294 hp GA+ — 199 EUR · 294 hp |
Select → | |
Each engine has its own tuning box: GAN GT / GTL or GAN GA / GA+. Prices are per box and include the current discount.
Not sure which engine you have?
The badge alone is not enough: in this generation, the same engine designation came in different power outputs, each with its own calibration. Check the power output in your registration document and find the matching row.
Same badge, different factory power outputs in this generation:
Mercedes-Benz R W251 remap: what changes
The GAN box plugs in between the sensors and the engine control unit (ECU) and adjusts their signals, while a flash remap rewrites the ECU itself. Your manufacturer’s warranty is preserved: the ECU software is never changed, and the box can be removed at any time.
- Bluetoothchange modes from your phone
- 18 mapsfine-tuning for your engine
- 15 minutesfitted to the factory connectors
- IP67water and dust protection
- +70 hpbest in this generation
350 CDI 4MATIC BlueEF 265 hp → 335 hp. The other engines gain at least +22 hp; check the table for each one.
- +136 Nmfor diesels
Diesels gain mostly torque: +107 to +136 Nm, which helps with overtaking and towing.
- up to +12%with the GAN GA+ on naturally aspirated engines
For 4 naturally aspirated engines: GAN GA / GAN GA+ tuning boxes; check the table for each engine’s figure.
- 50 daystest drive
Feel the difference or get your money back, excluding delivery costs.
Mercedes-Benz R W251 remap: common questions
Which tuning box do I need for the R W251?
Turbocharged engines take the GAN GT or GAN GTL, naturally aspirated ones the GAN GA or GAN GA+. Find your engine in the table above – each row shows the box and its price.
Is a tuning module the same as a Stage 1 remap?
Not quite. Stage 1 usually means an ECU remap without replacing any parts. The tuning module also works without replacing parts, but it does not change the ECU software: it adjusts the sensor signals, comes off in about a minute, and the OFF button in the app restores the factory settings.