dÄHLer Engine Performance Tuning - BMW F44 M235i xDrive

QT Parts is a Finnish online store.

Our warehouse is located in Nokia, Finland.

You can collect your order directly from us if needed. Simply select “Pickup” at checkout.

Pay securely with multiple payment methods, including invoice and installment plans through Klarna.

The delivery time for products in stock is 1-5 business days. We ship worldwide.

If the product is not in stock and it is a pre order product, the average delivery time is 5-21 business days. If the product has a longer delivery time than previously announced, we will be in touch. International orders may be subject to VAT, import duties, and customs fees upon arrival in the destination country.

Terms for product returns:

• You must return the ordered products within 14 days of receiving
• The products must be unused and without damages
• Commission fee for handling returns is 21,90€
• For product returns, the customer is in charge of the return costs. Only door to door service (Express)
• Shipping costs are not refunded

For international orders sales are final and non-refundable. Once an order is placed, it cannot be canceled or returned. By placing an order, you acknowledge and agree to these terms.

Return address: QT Parts, Vasarakatu 8B, 37150 Nokia, Finland.

Pre order / made-to-order products

If the product you have ordered is a pre order or made-to-order item, it is not subject to the 14-day right of withdrawal or return under consumer protection laws, as the product is manufactured or sourced specifically based on the customer’s individual order.

If you wish to cancel your order before receiving the product, we will refund 50% of the total order amount.

This condition applies to the following product categories:

• Suspension
• Engine Tuning
• Engine Parts
• Exhaust Systems
• Fueling
• Turbochargers/superchargers
• Drivetrain
• ECE-approved Downpipes

All of the above products are manufactured or sourced individually based on the customer’s order, and therefore cannot be returned after delivery, unless the product has a manufacturing or material defect.

In the event of such a defect, the standard liability for defects as provided by consumer protection legislation shall apply.

TUV-approved, legal external engine control unit (ECU)

Developed in Switzerland – manufactured in Germany.
Compatible with vehicles manufactured both before and after 06/2020.

The dAHLer Engine Performance Tuning module for the BMW M235i F44 provides power and torque without fault codes or interference. The wiring harness is equipped with original-like connectors that plug into the engine's boost pressure sensors and camshaft position sensor – in a completely Plug & Play style.

Performance increase:

Max Power: +41 hp / +30 kW
Max Torque: +85 Nm / +63 ft-lbs

Standard values:
306 hp (225 kW)
450 Nm (332 ft-lbs)

Improved values:
347 hp (255 kW)
535 Nm (395 ft-lbs)

Values are based on 98-octane fuel.

Smart control via smartphone

The dAHLer Engine Performance Upgrade module can be conveniently controlled via your smartphone.

With the free dAHLer Mobile App (iOS and Android, Bluetooth 4.0 compatible), you can:

• Choose from three different performance maps

• Update the device software to the latest versions for free

• Turn additional power on or off – even while driving

• Set an engine warm-up timer before activating tuning

No separate app fee is required.

Easy installation and reversibility

Installation takes less than 45 minutes, completely without removing the DME.
The module is fully reversible to original factory settings and can be removed without a trace – for example, during service visits.

An adapter is also included, which allows the car to be returned to its original state without removing the wiring harness.

Safe, effective, and discreet solution

The control unit inside the dAHLer tuning module communicates seamlessly with BMW's original ECU. Advanced algorithms adjust fuel delivery, ignition timing, and boost pressure according to engine load and RPM – fully in line with factory logic.

• Does not affect car diagnostics or service functions

• Leaves no traces and is not visible to diagnostic tools

• Includes a valet connector, allowing the car to be instantly returned to factory state

Features and benefits

• Power increase up to +41 hp with a stock engine

• Compatible with cars before and after 06/2020

• No DME removal

• Smartphone control

• Quick Plug & Play installation

• Works in all driving modes

• Fuel consumption remains normal

• Also works with 93-octane (or equivalent) fuel

• No VIN lock – can be removed and resold

• Made in Germany

• 3-year worldwide product warranty

The product has a 3-year worldwide warranty.
Please note that dAHLer Competition Line does not guarantee the legality of the product for road use in all countries and is not responsible for any potential effects on the vehicle manufacturer's warranty.