Skip to main content

Hack BMW’s Active Sound Design system to sound like an M4 or Rolls-Royce Ghost

The growing trend of pumping phony engine notes through a car’s stereo system is a much maligned feature that automakers have been using to satisfy the driver’s desire for that raw, audible experience without compromising the comfort sound baffling and insulation brings to the cabin. The intent is at leas noble, as far as recognizing enthusiasts want that sound, its just the execution that falls a little flat. Still, one driver made the best of his BMW’s Active Sound Design, thinking if his car is going to deliver a fake engine noise, why not upgrade it to an M4?

In the video, the driver demonstrates how his BMW m135i can sound just like the Bavarian automaker’s M4 sports car, at least on the inside. According to posters on a German forum, if the car is equipped with a Harman Kardon or Bang & Olufsen system, anyone with a savvy knowledge of coding can swap out the sound files in the BMW’s ECU.

2015 BMW M4 engine open
The 2015 BMW M4 ‘s engine Image used with permission by copyright holder

Ok, so it’s not exactly easy, but relatively speaking, anyone who knows what they’re doing can have the sound of a Rolls-Royce V12 coursing through the interior of a 1 Series if they wanted.

If anything, it demonstrates the silliness of the Active Sound Design gimmick. Enthusiasts enjoy that guttural, mechanical sound of an engine for several reasons, not the least of which is that satisfying recognition that all these components are at work, creating very real and distinct sounds as they churn, and resonate and so on.

The fact that it’s a digital sound file also rubs people the wrong way. Ford’s Focus ST got a lot of stick for a “fake” engine noise, but that was in reality real engine noise piped into the cabin via a corrugated tube with a diaphragm in it, and I think many naysayers to the current trend would be far happier to at least have that.

If automakers insist on continuing with this trend, then they should go all the way and have fun with it, instead of trying to pass it off as “engine sound enhancement.” Instead of being disingenuous, they should do what Renault does in the Clio, which has a menu of fake engine sounds ranging from a motorcycle to a sci-fi concept car that sounds like the Jetsons family vehicle.

If anyone wants to give it a go, this thread at 2Addicts will point you in the right direction.

Editors' Recommendations

Alexander Kalogianni
Former Digital Trends Contributor
Alex K is an automotive writer based in New York. When not at his keyboard or behind the wheel of a car, Alex spends a lot of…
Rivian R2 vs. Kia EV9: battle of affordable electric SUVs
Kia EV9 GT-Line Three Quarters

The long-awaited Rivian R2 has finally been announced, and it's an excellent option for those who want an electric SUV that doesn't completely break the bank. Sure, the R2 isn't cheap -- but it's a whole lot cheaper than most other EVs out there, especially when it comes to SUVs. But Rivian isn't the only company trying to tackle the problem of the budget electric SUV. The Kia EV9 is finally available, and it too offers a modern design and a range of helpful features.

Given the fact that the Rivian R2 and Kia EV9 are two electric SUVs in a similar price range, you might be wondering which is better for your needs. That's why we put the Rivian R2 and the Kia EV9 head-to-head.
Design
Both the Rivian R2 and the Kia EV9 are actual SUVs -- not crossovers pretending to be SUVs, like plenty of other EVs out there. The two vehicles offer big, boxy designs and plenty of interior space, making them excellent options for families or those who need that extra storage.

Read more
Rivian R2 vs R1S: How will Rivian’s cheaper SUV compare?
The front three-quarter view of a 2022 Rivian against a rocky backdrop.

Rivian has finally unveiled the R2, its long-awaited attempt at a more affordable electric SUV. The new vehicle may not be available just yet, but fans of Rivian's design aesthetics and feature set are already looking forward to being able to order the new car. The R2 is targeted at being a more affordable take on the electric SUV and will sit alongside the flagship-tier R1S.

Let's get this out of the way right now: The R1S is most likely going to be a better vehicle than the R2. Rivian isn't replacing the R1S with the R2 — it's releasing the R2 as a more affordable alternative, and there will be some compromises when buying the R2 over the R1S.

Read more
Cybertruck production reportedly halted over pedal issue
Tesla CEO Elon Musk behind the wheel of a Cybertruck.

Tesla CEO Elon Musk behind the wheel of a Cybertruck. Tesla

Tesla’s Cybertruck has been hit by a production delay caused by an issue with a part of the vehicle, a number of media reports have claimed.

Read more