Description
Dinan Performance Engine Software – 2002-2005 BMW 745i is a Dinan staged performance ECU calibration. Supplied for E65/E66.
Key Features:
- Recalibrated engine management: A full re-tune of the factory engine program rather than a boost-only change, with Dinan’s own safety limits left in place.
- Octane-matched options: Dinan publishes calibrations for different fuel grades, so the map suits the pump fuel you actually run.
- Factory safeguards retained: The stock protection strategies stay active, which is what keeps the tune drivable day to day.
- Dealer-style driveability: Dinan calibrations are developed on the dyno and on the road for smooth part-throttle manners, not just peak numbers.
Fitment:
- BMW 745i 2002-2005
- BMW 745Li 2002-2005
Dinan part D900-457. Confirm fitment against your exact model and build date before ordering.

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