Considering an ECU remap for your BMW 6 Series 645ci 333hp? A Stage 1 remap can take this E63 - 2004 - 2010 petrol engine from 333 BHP to 355 BHP and from 450 Nm to 480 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 6 Series can achieve.
The BMW 6 serie 645ci 333hp is a 4.4L naturally aspirated petrol engine producing 333 BHP and 450 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 355 BHP and 480 Nm — a gain of around 22 BHP (7%) and 30 Nm (7%).
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. at this torque level, transmission and driveline servicing history becomes especially important..
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 |
|---|---|---|---|---|---|
| 630i 258hp |
| 258 → 284 |
| +26 |
| 300 → 330 |
| +30 |
| Moderate (4.5/10) |
| 630i 272hp | 272 → 285 | +13 | 300 → 330 | +30 | Moderate (4/10) |
| 635D 286hp | 286 → 332 | +46 | 580 → 685 | +105 | Good (6.5/10) |
| 635D 306hp | 306 → 340 | +34 | 600 → 680 | +80 | Good (6/10) |
| 650ci 367hp | 367 → 390 | +23 | 490 → 525 | +35 | Limited (3.5/10) |
| M6 5.0 V10 - 507hp | 507 → 530 | +23 | 537 → 560 | +23 | Limited (3/10) |
Get a personalised remap quote for your BMW 6 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.
