AC Schnitzer 'Performance Upgrade' for 4 Series G22/G23 LCI Engine:4 Series 420i / 420i xDrive G22/G23 LCI (B48C) Petrol 135 kW / 184 hp *NO TUV* and remapping the ECU is

and remapping the ECU is mandatory when it is fitted

Clean your cars door cards

The front view of the airboxes clearly show how restricted the stock version is

Please check to see if you have either 10mm or 12mm Banjo

AC Schnitzer 'Performance Upgrade' for 4 Series G22/G23 LCI Engine:4 Series 420i / 420i xDrive G22/G23 LCI (B48C) Petrol 135 kW / 184 hp *NO TUV* and remapping the ECU isPhilosophy Technology Engine tuning and performance upgrades have a long tradition at AC Schnitzer. To be on the safe side, we forgo achieving the possible maximum power in favour of greater durability. Many of our performance upgrades are therefore designed to increase torque rather than horsepower. After all, torque is what you feel when, for example, you are "pressed into your seats" when moving off. Petrol The performance upgrade consists of a