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Home / ECU Remapping / BMW 420i
B48 Engine

BMW 420i

G22/G23/G26

The G22 420i runs a detuned B48 with headroom for a meaningful power increase. A Stage 1 remap transforms the driving experience.

184 Stock BHP
240 Stage 1 BHP
290+ Stage 3 Ceiling
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BMW 420i G22/G23/G26
Performance Stages

B48 Tuning Stages

All power figures are average estimates based on typical results. Actual gains depend on vehicle condition, fuel quality and supporting modifications.

01

Stage 1

220-240 bhp

Software only. No hardware changes required. Custom ECU calibration on fully standard engine.

  • Custom map written in-house
  • No additional parts needed
  • Fully reversible
02

Stage 2

250-270 bhp

Calibrated for bolt-on modifications. Downpipe, intake and supporting hardware.

  • Requires supporting hardware
  • Mapped to your specific mods
  • Data-logged and validated
03

Stage 3

290+ bhp

Full custom calibration for serious builds. Hybrid turbos, uprated fuelling and bespoke mapping.

  • Hybrid or upgraded turbo
  • Uprated fuel system
  • Bespoke build calibration

Ready to Tune Your 420i?

Get in touch to discuss your build. Every map is written in-house and tailored to your car.

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