BMW M440i xDrive Convertible G23
The new BMW 4 series Convertible G23 in the most powerful version as M440i xDrive. Other models like the 420i or 430i have been upgraded by dAHLer Competition Line as well to create a razor-sharp BMW 4 series convertible to conquer the roads.
Our Engine tuning performance upgrades work with cars before and after production 06/2020!
Unleash up to 427 hp (314 kW) -> 432 hp for US Models and impressive 600 Nm (443 ft-lbs) of torque and control the power via your smartphone. Lowering kits, 20 inch forged & alloy wheels, performance exhaust systems, carbon and other high-performance tuning parts by dAHLer will transform your BMW 4 series Convertible G23 into a true power Convertible.
BMW M440i: Engine Performance Tuning
QUICK FACTS
EU Version -> US Version
Max HP gain:
53 hp (39 kW) -> 50 hp US
Max Torque gain:
100 Nm -> 74 ft-lbs US
Standard power:
374 hp (275 kW) -> 382 hp US
500 Nm -> 369 ft-lbs US
Enhanced power:
427 hp (314 kW) -> 432 hp US
600 Nm -> 443 ft-lbs US
Based on 98 octane -> 93 octane US
Learn more - Tuning for BMW 4 series Convertible G23 M440i & M440d
THE 4 – BMW 4 series Convertible G23 M440i xDrive & M440d xDrive
M440i based on 374 hp (275 kW), 500 Nm (369 ft-lbs):
- Enhanced power: 430 hp (316 kW), 610 Nm (450 ft-lbs)
based on 98 octane gas rating
M440d based 340 hp (250 kW), 700 Nm (516 ft-lbs):
- Enhanced power: 394 hp (290 kW), 800 Nm (590 ft-lbs)
– WLTP-E6d-temp tested and EU/CH homologated by the German TUV
– Engine Performance Tuning Module includes wiring harness
FEATURES
- Works with cars before and after production 06/2020
- No removal of the DME required
- Controlling of the Performance Tuning via your smartphone
- Quick Plug & Play Installation
- Runs as smoothly as stock, this is how your BMW should have come from the factory
- Compatible with all driving modes
- Fuel economy unchanged during normal driving
- 93 octane or less compatible tuning maps
- Not VIN locked, can be removed without a trace and resold down the road
- Developed in Switzerland and Made in Germany
- Tested on the German Autobahn
- Comes with TUV Part Approval (emission tests according to WLTC regulations)
- Worldwide 3-year product warranty
Learn more - App Control
App Control
Controlling of the dAHLer Engine Performance Upgrade via your smartphone is just one of the awesome features of our tuning module.
With our tuning module you have the option to choose your own and fully customizable driving program. Wirelessly connect the dAHLer engine tuning performance module to your Bluetooth 4.0 compatible iOS and Android device via the free dAHLer Mobile app.
This option allows you to change 3 different performance maps, and update the firmware worldwide as we release free newer versions with updates, more powerful maps. If desired the extra power can be easily switched on or off with your smartphone, even while driving.
Our app includes a configurable warm-up timer, so the pilot can decide how long warming up is needed before using the engine tuning. A separate Mobile app purchase is not required!
We will provide you the app after the purchase of our engine performance upgrade free of charge.
Diesel Tuning
What about the latest diesel technology?
We offer engine performance tuning for the BMW 420d, 420d xDrive, 430d, 430d xDrive and M440d xDrive G23.
Our tune works with BMW cars before and after production date 06/2020 as well as with all latest BMW Hybrid models and is approved by the German TUV (EU homologated) to meet the latest emission standards.
Developed in Switzerland and quality Made in Germany
Inside our Engine Performance Tuning Module for the BMW 420d, 420d xDrive, 430d, 430d xDrive and M440d xDrive G23 is an advanced control unit that is designed to optimize and work with the factory BMW ECU.
With the dAHLer multi-map technology, up to five channels are optimized in real time – whether common rail, boost pressure, or turbo pressure, our tune controls the most technologically BMW diesel engines of the latest generations in a multi-dimensional multi-map with all relevant engine parameters perfect looking.
The dAHLer Engine Performance Tuning for the BMW 420d, 420d xDrive, 430d, 430d xDrive and M440d xDrive G23 increases the boost pressure and the amount of fuel by changing the rail pressure by a small amount which results in more power and torque but stays within the BMW engine’s safety regulations.
Another advantage of the dAHLer multi-map technology is compliance with the legal emission values specified for the BMW diesel engine. Due to the combustion optimized in all power ranges, the fuel is used 100% efficiently.
This means that the dAHLer engine performance tuning for the BMW 420d, 420d xDrive, 430d, 430d xDrive and M440d xDrive G23 can also be used without restriction in vehicles with a diesel particle filter. Compliance with the emission values is confirmed by the TUV certificate.
Learn More - About our technology
DESCRIPTION
Our Engine Performance Tuning Module for the BMW 4 series Convertible G23 (M440i xDrive, 430i, 420i) integrates flawlessly to extract maximum power and torque without faults and errors – just flawless. The harness has OEM style plugs to connect in-line with each boost pressure sensor and the camshaft position sensor on the engine.
Our Engine Performance Tuning Module for the BMW 4 series Convertible G23 is completely reversible to OEM specs and installs in less than 45 minutes just in a few simple steps. This will be a safely upgrade which makes this the easiest and most effective power upgrade you will ever make on your BMW 4 series Convertible G23. For a substantial increase in power output, with minimal downtime for installation, full serviceability, and can be reverted back to stock then this Engine Performance Tuning Module power upgrade is best!
Inside our dAHLer Engine Performance Tuning Module is an advanced control unit that is designed to optimize and work with the factory BMW ECU. BMW 4 series Convertible G23 tuning maps and algorithms within the control unit have been elevated for this BMW engine, sending improved fuel and ignition parameters to the stock ECU to control boost depending on load, engine speed, and other factors.
Also included in the scope of delivery is an adapter which, when installed, returns the vehicle to its original state without having to remove the cable harness of the dAHLer engine performance upgrade. This can be used, for example, at a workshop appointment.
The dAHLer Diesel Engine Performance Tuning Module for the BMW 4 series Convertible G23 420d, 430d and M440d xDrive lengthens the injection time by a small amount which results in more power and torque but stays within the BMW engine’s safety regulations. Our latest technology also controls boost pressure to unleash a wave of torque at low rpm.
SAFETY
With our Engine Performance Tuning Module all of the factory safeguards of your BMW 4 series Convertible G23 remain in place, including overload protection and warm-up protocols to preserve longevity and factory drive-ability. One of the amazing advantages of this type of system is that it is unaffected by factory BMW updates and service.
If BMW updates the computer software of the BMW 4 series Convertible G23, our Engine Performance Tuning Module is not lost or overwritten. This is where competitor tuning modules fall short! This is just another key aspect of our module because BMW is constantly releasing small software updates. All of the factory diagnostics and service access is retained.
The Performance Tuning Module for the BMW 4 series Convertible G23 is undetectable to plug-in diagnostic readers and it leaves no traces behind. A valet connector is included and installs in minutes to bypass the Engine Performance Tuning Module and revert the car to factory settings. With the valet plug installed the BMW engine computer will use the stock maps instead of getting modified data from the Engine Performance Tuning Module.
THE 4 – BMW 4 series Convertible M440i xDrive G23: Eventuri Intake
Fitment for all BMW 4 series Convertible M440i xDrive G23 with B58 engine built after November 2018.
Learn More - About Eventuri
The BMW 4 series Convertible M440i xDrive with B58 engine – OEM airbox system was updated in cars built after November 2018 where the airflow sensor was replaced with a temperature sensor in the inlet tube.
The BMW M440i xDrive G23 – B58 Eventuri intake has been developed to provide the turbo with a less restrictive flow path whilst maintaining low inlet temperatures.
Crafted from Prepreg Carbon Fiber, the airbox serves 2 objectives – to seal the filter against engine bay heat and to provide a dual cold air feed.
With a smooth inlet track to the MAF tube/Engine inlet and by ensuring Eventuri has an effective cold air supply to the filters, the resultant performance increases translate to an enhanced driving experience:
- Throttle response is sharper as air speeds in the inlet track are maintained by the Venturi effect
- Low/mid-range torque is increased which improves general drivebility. The car feels more aggressive and eager to drive, like an engine tuning performance.
- Top end power is increased as the engine is allowed to draw in cold air with less restriction.
Couple the dAHLer engine performance tuning increase with a more audible and sonorous induction sound and the overall driving experience is much more involving and more fun.
FEATURES AND BENEFITS
Each Eventuri intake system consists of:
- Carbon Fiber Airbox with Dual Feeds
- Bespoke High Flow Dry Cone Filter
- Carbon Fiber Inlet Tube
- CNC Machined Temperature Sensor Mount
- CNC Machined Breather adapter
- Heat Shield with Gold Reflective Backing
- Laser Cut Stainless Steel Brackets
- Silicon Coupler with OEM Specification Clamps
dÄHLer ATTC – A power pedal with extra features and app control
Give your ALPINA or BMW a new way of anti-theft protection and at the same time a way better engine response with the dÄHLer Anti-Theft Throttle Commander combined with all Power Pedal features. Controlling of the dÄHLer ATTC via your smartphone is just one of the awesome features of our device.
Anti-Theft System
The revolutionary dAHLer anti theft system comes with an Anti-Theft Mode, a Valet Mode, Power Pedal Mode and is a must have if you want to protect your ALPINA or BMW against theft.
You control your dAHLer Anti-Theft Throttle Commander – ATTC with the included remote control unit without losing sight of the essentials.
How does the ATTC work?
Our module, wiring harness and remote (Anti-Theft System) can be installed in any ALPINA, BMW, BMW M, BMW Plug-in Hybrid and BMW Electric vehicle with an electronic gas pedal and is ready for use immediately after installation.
It’s is a direct plug into the existing (OEM) harness.
The dAHLer Anti-Theft Throttle Commander disables the accelerator pedal on the next vehicle start. This makes it impossible to rev-up the engine without having the dAHLer remote control.
Criminals might be able to crack the signal, open the door, even start the engine and shift in gear, but this is where the story ends. They are unable to move the car.
It is not necessary to activate the Anti-Theft mode again after each stop. The function remains activated by default until the function is deactivated again.
Grand Theft Auto - Is it really that simply to steal a modern car?
Unfortunately, it is absolutely simple, takes 2 minutes with the right technology which is mostly in the hands of criminals.
In vehicles with a keyless go or a similarly functioning system, theft is carried out by means of a relay attack.
Criminals try to intercept signals
It has been known for years that the trick works in front of single-family homes, in parking lots, even while you sit in coffee shop, where there is often only a short distance between the car and the car keys. But underground car parks in large apartment buildings? Yes, perpetrators also run through the stairwells of apartment buildings and try to intercept signals on the apartment doors.
Nationwide in the United States in 2020, there were 810,400 vehicles reported stolen, up from 724,872 in 2019 and that number has increased dramatically in the last two years.
Accelerator pedal tuning
In modern BMW cars when you step on the throttle, you’re not moving a linkage anymore. You’re actually sending a signal to a computer and most of these new BMW have a lot of what is termed dead pedal.
You step on the pedal and it takes one or two inches of travel before anything happens in the vehicle. After the install of the the dAHLer Anti-Theft Throttle Commander ATTC the gas pedal response will improve immediately.
Does it give you any more power?
No, the dAHLer ATTC with Power Pedal features doesn’t give you any more engine power but it makes the vehicle feel a lot more responsive and instead of pushing the gas pedal all the way into the carpet to get maximum engine performance power, you can push the pedal halfway down and your BMW will accelerate like you had it all the way down.
With the dAHLer ATTC device installed there are a lot more responsive and making your car act like a hot rod!
BMW 4 series: M440i Performance Exhaust System
4-pipe stainless steel performance exhaust system
An addition to our exceptional performance upgrades for your BMW 4 series Convertible M440i xDrive G23 is the dAHLer performance exhaust system, taking it to the next level.
Learn More
You’re looking for a high-quality German-made stainless steel performance exhaust system with dual exhaust flap for your BWM 4 series M440i xDrive?
Our dAHLer performance exhaust systems for the BMW M440i xDrive G23 is handcrafted from high quality 1.4301 stainless steel and are Made in Germany by a team of specialists at an ISO 9001:2015 certified facility.
A dAHLer performance exhaust system for the BMW M440i xDrive G23 comes with a high-performance muffler(s) and double exhaust flap system with no drone on the highway of a much more aggressive sound then the stock muffler but still be perfectly livable for daily driving.
Not only do we engineer our valve-controlled performance mufflers to sound good we engineer the performance exhaust systems that fit your BMW 4 series Convertible M440i xDrive G23 properly for a much easier installation.
Designed to mount using the factory BMW M440i xDrive G23 exhaust hangers, the dAHLer performance exhaust system is a bolt-on replacement for the OEM version. To help reduce the time you spend installing the dAHLer performance exhaust system on your BMW 4 series Convertible M440i xDrive G23, slip-fit joints are included to make fitment as easy as possible. Our quad or double exhaust tips are designed to fit the stock BMW M diffuser.
The dAHLer performance exhaust system for the BMW 4 series Convertible M440i xDrive G23 includes a high-flow, valve controlled, stainless-steel performance muffler, and is available as a cat-back system.
Our performance exhaust system for the BMW M440i xDrive G23 is here to improve your driving experience with an awesome sound and a noticeable bump in performance.
Under normal driving conditions, our valve-controlled performance muffler stays closed, and the dAHLer performance exhaust system for the BMW 4 series Convertible M440i xDrive G23 is quite unassuming and nobody will really even suspect your car even has an aftermarket performance exhaust system or muffler. But, when you open up the throttle, the valve-controlled system opens up the exhaust flaps, and our performance exhaust system gives your BMW 4 series Convertible M440i xDrive G23 a menacing growl.
Would you like a little more? Chose our Stage 2 exhaust system!
For racing and sound enthusiasts among BMW drivers, dAHLer offers an additional remote-controlled exhaust flap / valve control system for club sport events and track days. For those who want to be fully in command of the exhaust sound of their BMW 4 series Coupe M440i xDrive G23 at any time and get the race car like feeling.
For more details make sure you check out our category Exhaust Flap / Valve Control
THE 4 – BMW M40i: Sound Video
4-pipe stainless steel performance exhaust system
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dÄHLer IP68 Rated Valve Controller
The new 2025 IP68 rated waterproof dÄHLer Valve Control Modular
What does the new IP68 rated mean?
How does it work?
MFM Mode
EOP Mode
Worldwide Product Warranty
Important Notice
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More InformationTHE 4 – BMW 4 series Convertible G23: Performance Lowering Kit
Performance Lowering Springs are the first step in suspension performance enhancement. A dAHLer lowering kit for the BMW 4 series Convertible G23 is a performance spring set created for the serious enthusiast.
Learn More - About Lowering Kit
A sports spring set with the lowest possible drop but with the exceptional ride quality you expect from a high-class tuner like dAHLer.
Using progressive spring technology to lower the vehicle’s center of gravity.
This proprietary progressive design delivery, both a smooth softer initial spring rate for exceptional ride quality combined with a stiffer final rate for high performance handling of your BMW 4 series Convertible G23.
The benefits of a lower stance are many. Let’s begin with the performance advantages of a dAHLer sports spring set installed in your BMW 4 series Convertible .
A dAHLer lowering spring equipped BMW 4 series will exhibit reduced body roll in corners as well as reduce squat during acceleration and diminish nosedive under braking.
Another performance advantage that is often overlooked is the reduced drag coefficient. A dAHLer sports spring set for the BMW 4 series Convertible provides the ultimate balance between high performance, extreme lowering and comfortable ride quality.
BMW 4 series Convertible G23: 20” FORGED Wheel Sets
Modern BMW cars like the BMW 4 series Convertible G23 typically come with these heavy stock alloy wheels. Even when you have spent lots of money on a better BMW accessory wheel & tire package, those wheels are still not weight optimized and most of the people won’t recognize the difference as they simply think those wheels come from factory anyhow. It needs a real BMW enthusiast to tell the difference.
So, how to make a real difference?
Learn More - About FORGED Wheels
Where others draw a final Line at 19″, dAHLer provides your BMW 4 series Convertible G23 the finishing touch with high-quality and ultra-light 20″ FORGED wheels for BMW 4 series Convertible G23. All dAHLer FORGED wheels for the BMW 4 series Convertible G23 are manufactured at an ISO 9001:2015 certified facility, in Germany according to the latest regulations to fulfill the highest safety standards.
dAHLer has designed a wheel which meets the highest demands with maximum strength and at the same time the lowest weight. The True greatness for the BMW 4 series Convertible G23 to develop the maximum performance of your BMW 4 series Convertible.
So, give your BMW 4 series Convertible something to set apart from the crowd with a 20 inch dAHLer wheel and tire package for your BMW 4 series Convertible G23.
FORGED WHEEL ADVANTAGES AT A GLANCE:
- 30% to 35% weight saving compared to conventional light alloy wheels
- significantly improved longitudinal and lateral dynamics
- significantly improved acceleration and deceleration values due to the lower accelerated mass
- improved and more agile handling/steering behavior
- high-quality paint (powder coating) for perfect protection of the forged wheel surface
- with integrated FORGED and dAHLer lettering
We ship worldwide!
Give us a call or drop us an email to learn about what we can offer to customize your BMW car.