Mercedes-Benz SLK (R171) 2004-2011 350 268bhp remap figures
Thinking of remapping a Mercedes-Benz SLK 350 268bhp? The standard car makes 268bhp and 350Nm; with a Stage 1 remap from our Leicester workshop we expect around 300bhp and 391Nm, up to +32bhp and +41Nm.
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 | 268 bhp | 300 bhp | +32 bhp |
| Torque | 350 Nm | 391 Nm | +41 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 268 bhp | 350 Nm | |
| Stage 1Maximum software-only performance | 300 bhp | 391 Nm | +32 bhp +41 Nm |
| Stage 1 EcoPerformance with economy in mind | 292 bhp | 388 Nm | +24 bhp +38 Nm |
| Eco mapEconomy first | 289 bhp | 386 Nm | +21 bhp +36 Nm |
Who is the Stage 1 map for?
- Drivers who want a sharper throttle and a small, honest gain from software alone.
- Owners who would rather keep the car standard in every other way.
- Anyone who wants the fullest software-only map for this engine, accepting that the gain is modest without a turbocharger.
What this means for your SLK
Naturally aspirated petrol engines have no boost to raise, so gains from software alone are more modest than on a turbocharged car and come from fuelling, ignition and throttle response.
Engine management is by a Bosch ME9.7 unit. Older engine management is simpler to work with, but age matters: worn sensors, leaks and tired components can hold back what a remap delivers, which is why we run a diagnostic check first.
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 SLK 350 268bhp?
We expect 300bhp and 391Nm against 268bhp and 350Nm as standard: up to +32bhp and +41Nm. 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 SLK 350 268bhp?
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: 292bhp and 388Nm expected. The Eco map is economy first: 289bhp and 386Nm. Both still sit above the standard 268bhp and 350Nm.
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 SLK figures
Other petrol variants
- 280 227bhp 2004-2011
- 230K 197bhp 2004-2011
- 55 AMG 354bhp 2004-2011
- 200K 181bhp 2004-2011
- 200K 163bhp 2004-2011
All petrol SLK (R171) variants · SLK (R171) 2004-2011 overview · All Mercedes-Benz figures