BMW 435i N55 ECU remap - stage 1 (400 bhp) or stage 2 (420 bhp)

Custom ECU remap for the BMW 435i with N55 engine. No off-the-shelf files - each tune is built and validated on a hub dyno, then calibrated to your car’s hardware, fuel, and condition.

• Stage 1: 400 bhp - works on stock or lightly modified cars
• Stage 2: 420 bhp - requires supporting mods like an upgraded intercooler or downpipe
• Included: OBD or bench unlock, full health check, and calibration at our UK tuning facility
• Optional extras: cold start delete, burble tuning, GTS-style startup sound