Mercedes-Benz GL 2006-2012 420 CDI 301bhp remap figures
Thinking of remapping a Mercedes-Benz GL 420 CDI 301bhp? The standard car makes 301bhp and 700Nm; with a Stage 1 remap from our Leicester workshop we expect around 363bhp and 810Nm, up to +62bhp and +110Nm.
Choose your map
Stage 1 remap figures
A Stage 1 remap is a software-only change to the ECU on an otherwise standard car. It needs no extra parts, which makes it the usual starting point.
| Stock | Vanguard expected | Expected gain, up to | |
|---|---|---|---|
| Power | 301 bhp | 363 bhp | +62 bhp |
| Torque | 700 Nm | 810 Nm | +110 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 301 bhp | 700 Nm | |
| Stage 1Maximum software-only performance | 363 bhp | 810 Nm | +62 bhp +110 Nm |
| Stage 1 EcoPerformance with economy in mind | 348 bhp | 801 Nm | +47 bhp +101 Nm |
| Eco mapEconomy first | 343 bhp | 796 Nm | +42 bhp +96 Nm |
Who is the Stage 1 map for?
- Drivers who want stronger pulling power for overtaking, hills and towing, with no parts to fit.
- Daily and motorway drivers who want the engine to feel less strained at cruising speed.
- Anyone who wants the biggest software-only change we list for this engine.
What this means for your GL
Diesel remaps work mainly on boost pressure, fuel delivery and torque limiters, which is why the Nm gain is usually the figure you feel in everyday driving, particularly when overtaking or towing.
Engine management is by a Bosch EDC16CP36 unit. We read the ECU on your car and compare it with the software listed here before any work starts, so you know what to expect before you commit.
We remap at our Belgrave Gate workshop in Leicester, or at your home or work within 30 miles, and every job starts with a diagnostic check.
Please note: these are expected figures, not guarantees. Real results vary with the condition of the vehicle, the ECU software version, fuel quality and the hardware fitted. Some options - including Stage 2 and anything that needs extra hardware - are for off-road or competition use only. We check every vehicle first and confirm what is achievable before any work starts.
Figures reviewed 22 October 2026.
Stage 1 questions
How much power does the Stage 1 map give the Mercedes-Benz GL 420 CDI 301bhp?
We expect 363bhp and 810Nm against 301bhp and 700Nm as standard: up to +62bhp and +110Nm. These are expected figures, and we confirm what is achievable on your own car after a diagnostic check.
Does a Stage 1 remap need any extra parts on the Mercedes-Benz GL 420 CDI 301bhp?
No. Stage 1 is a software-only change to the ECU on an otherwise standard car.
Is there a gentler map than Stage 1 for this engine?
Yes, two. Stage 1 Eco is performance with economy in mind: 348bhp and 801Nm expected. The Eco map is economy first: 343bhp and 796Nm. Both still sit above the standard 301bhp and 700Nm.
Do I need to tell my insurer about a remap?
Yes. A remap is a modification, so you should declare it to your insurer.
More Mercedes-Benz GL figures
Other diesel variants
- 350 CDI 261bhp 2006-2012
- 350 Cdi 254bhp 2006-2012
- 350 CDI BlueEFF 231bhp 2006-2012
- 320 CDI 220bhp 2006-2012
- 350 CDI BlueEFF 220bhp 2006-2012
All diesel GL variants · GL 2006-2012 overview · All Mercedes-Benz figures