Considering an ECU remap for your BMW 3 Series M3 420hp? A Stage 1 remap can take this E90/E91 - 2010 - 2011 petrol engine from 420 BHP to 440 BHP and from 400 Nm to 430 Nm of torque (naturally aspirated). This engine scores 3.5/10 for remap suitability. Get a free personalised quote from a trusted remap professional and find out exactly what your BMW 3 Series can achieve.
The BMW 3 serie M3 420hp is a 4.0L naturally aspirated petrol engine producing 420 BHP and 400 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 440 BHP and 430 Nm — a gain of around 20 BHP (5%) and 30 Nm (8%).
This engine has limited remap suitability, though the available headroom is limited, so gains are modest compared to higher-output variants. The tuning headroom is classified as limited, based on the percentage gain available from the factory output.
From a technical perspective, the transmission is many variants use zf 5/6-speed automatics (where fitted); manuals also exist..
Considerations: Naturally aspirated engine: gains are usually limited; results vary widely.. High tuned torque: check transmission torque capacity and service history.
All figures shown are typical estimates based on aggregated Stage 1 data for this engine variant. Actual results depend on vehicle condition, mileage, and the chosen tuning method. We recommend discussing your specific vehicle with a qualified remap professional.
| Engine | BHP | Gain | Torque | Gain | Score |
|---|---|---|---|---|---|
| 316D 115hp | 115 → 180 |
| +65 |
| 260 → 400 |
| +140 |
| Excellent (8.5/10) |
| 316i 122hp | 122 → 136 | +14 | 160 → 177 | +17 | Moderate (4.5/10) |
| 318D 136hp | 136 → 180 | +44 | 300 → 390 | +90 | Excellent (8.5/10) |
| 318D 143hp | 143 → 180 | +37 | 300 → 390 | +90 | Good (7.5/10) |
| 318i 143hp | 143 → 157 | +14 | 190 → 216 | +26 | Moderate (4.5/10) |
| 320D 163hp | 163 → 215 | +52 | 380 → 440 | +60 | Good (7.5/10) |
| 320i 170hp | 170 → 182 | +12 | 210 → 240 | +30 | Moderate (4.5/10) |
| 320D 184hp | 184 → 215 | +31 | 380 → 440 | +60 | Good (7/10) |
| 325D 204hp | 204 → 300 | +96 | 430 → 600 | +170 | Excellent (8/10) |
| 325i - N53 - 211hp | 211 → 265 | +54 | 270 → 315 | +45 | Moderate (5.5/10) |
| 330D 211hp | 211 → 300 | +89 | 520 → 600 | +80 | Good (7.5/10) |
| 325i - N53 - 218hp | 218 → 265 | +47 | 270 → 315 | +45 | Moderate (5/10) |
| 328i 230hp | 230 → 274 | +44 | 300 → 325 | +25 | Moderate (4.5/10) |
| 330D 245hp | 245 → 300 | +55 | 520 → 600 | +80 | Good (7/10) |
| 330i 272hp | 272 → 292 | +20 | 320 → 345 | +25 | Moderate (4/10) |
| 335D 286hp | 286 → 350 | +64 | 580 → 680 | +100 | Good (7/10) |
| 335D 306hp | 306 → 340 | +34 | 600 → 680 | +80 | Good (6.5/10) |
| 335i - N55 Twinscroll - 306hp | 306 → 360 | +54 | 400 → 520 | +120 | Good (7/10) |
| 335i - N55 Twinscroll PPK - 326hp | 326 → 360 | +34 | 400 → 520 | +120 | Good (7/10) |
Get a personalised remap quote for your BMW 3 Series. We'll connect you with a trusted professional in your area.
All figures shown are typical estimates based on aggregated Stage 1 data for this engine variant. Actual results depend on vehicle condition, mileage, and the chosen tuning method.
We recommend discussing your specific vehicle with a qualified remap professional before proceeding.
