Developed in Switzerland and made in Germany, the dAHLer Engine Performance Tuning Module for the BMW F40 M135i xDrive Hatch integrates flawlessly with your car to extract maximum power and torque without any faults or errors. Suitable for all F40 M135i xDrive models produced before and after June 2020.

The dAHLer Engine Performance Tuning Module features an innovative control unit that collaborates efficiently with the factory BMW ECU, resulting in optimal performance. The performance of the B48 engine is elevated with advanced algorithms and maps specifically designed for the F40 M135i xDrive. These enhanced features deliver improved fuel and ignition parameters, allowing the stock ECU to control boost according to load, engine speed, and various other factors.

Included in the scope of delivery is an adapter that allows for an easy return to your vehicle's original state, eliminating the need to remove the cable harness of the dAHLer engine performance upgrade. It's the perfect solution for a workshop appointment or any other situation that requires your vehicle to be returned to its original condition.

The dAHLer Engine Performance Tuning Module has a unique advantage over competitor tuning modules - it will not be lost or overwritten when BMW software update is performed. Additionally, the module is undetectable to plug-in diagnostic readers and ensures that all factory diagnostics and service access are preserved. 

The dAHLer Engine Performance Tuning Module comes packed with impressive features, including the ability to control it with your smartphone. The dAHLer Mobile app allows you to customize your driving program to suit your needs perfectly. Pairing with the module is easy using a Bluetooth 4.0 compatible iOS or Android device using the free dAHLer Mobile app.

With the dAHLer Mobile app, you can change 3 different performance maps, and update the firmware anywhere in the world as newer firmware versions are released.  The module can also be activated or deactivated using your smartphone, including while on the go. The app also includes a configurable warm-up timer, so you can choose how long the engine will warm up before the tune is activated.

Max Power Gain*
41 hp / 30 kW

Max Torque Gain*
63 ft-lbs / 85 Nm

Standard Power
306 hp / 225 kW
332 ft-lbs / 450 Nm

Enhanced Power*
347 hp / 255 kW 
395 ft-lbs / 535 Nm

*Based on 98 octane rating. Actual performance increase may vary.

The dAHLer Engine Performance Tuning Module for the F40 M135i xDrive includes a module, wiring harness and bypass plug. Tested and approved by the German TUV – comes with TUV approval document if required – EU homologated. Compatible with models built before and after 06/2020 production.

Experience the power of the dAHLer Engine Performance Tuning Module like never before - all controlled with just a few taps on your smartphone! The dAHLer module boasts of an amazing feature that allows you to choose and fully customize your driving program according to your preferences.

You can wirelessly connect your Bluetooth 4.0 compatible iOS or Android device to the dAHLer module using the free dAHLer Mobile app. You'll have access to three different performance maps, have the ability to turn the module on/off on the go and can even update the firmware as new versions are released. You can also configure a warm-up timer, giving you control over how long you need to warm up the engine before engaging the tuning software. The dAHLer app is free with the purchase of any tune module.

Please note that performance may vary depending on the manufacturing tolerances and fuel quality. For best results, we strongly recommend using high-quality fuels with an octane rating of at least 98 (US 93).

With the dAHLer Engine Performance Tuning Module installed, all factory safeguards of your car remain in place, including overload protection and warm-up protocols to preserve longevity and factory driveability. The module is also unaffected by BMW software updates and makes no change to your service requirements.

All original dAHLer Engine Performance Tuning Modules come with a worldwide, 3-year warranty.

Customers inside EU, CH, NO
An external insurance for the engine, gearbox and drive train is already included in the price.

Customers outside EU
dAHLer makes no guarantees to the lawfulness of any parts used for “on highway vehicles” and accepts no responsibility for compliance with the vehicle’s OEM warranty.

General remark
dAHLer will not be responsible for poor installation practices. dAHLer highly recommend having the assembly carried out by a professional. The product should not be installed by a private individual.

Any modification of the product leads to the automatic cancellation of the warranty.