[ohniner]

Reading all the posts on G87 M2 exhaust (s) is downright exhausting (pun intended).
My new 2025 M2 has me confused, can't get a handle on real engine noise and how to control it vs ASD which I want to avoid.
In my M1 and M2 buttons I have turned off ASD but is there a flap operated exhaust system that activates under certain settings?
Do the drive modes activate ASD in some amount?
I've trolled the forum and google but cannot find a good explanation of the overall system, is there something out there?
all repossess welcomed.

[yash27]

Full disclosure: I don't own an M2 yet

From what I understand, there is an exhaust flap but it is never fully open (even in sport settings). That's why people here get a valve controller to fully open the exhaust flaps.

[LeGoAuToPiLoT]

Somebody please correct me if I'm wrong.....

The "M Sound" setting is for computer generated car sounds through the car audio. I had no idea until I realized what it was....and therefore once it was off, how quiet the stock exhaust on the car really is.

My understanding is that the "Sport Plus" Engine mode does several things; one of which is open the stock exhaust valves. But they're never fully open past 75% i think it is. And I've also heard that those valves adjust with speed as well. It's also possible that the "M Sound" becomes more pronounced when you change engine modes.

I know Dahler makes a separate exhaust valve controller kit to force the valves open to 100%. I want more sound so I'm going full stainless Valvetronic exhaust....really hope I like it.

[Info@mad-us.com]

Originally Posted by LeGoAuToPiLoT

Somebody please correct me if I'm wrong.....

The "M Sound" setting is for computer generated car sounds through the car audio. I had no idea until I realized what it was....and therefore once it was off, how quiet the stock exhaust on the car really is.

My understanding is that the "Sport Plus" Engine mode does several things; one of which is open the stock exhaust valves. But they're never fully open past 75% i think it is. And I've also heard that those valves adjust with speed as well. It's also possible that the "M Sound" becomes more pronounced when you change engine modes.

I know Dahler makes a separate exhaust valve controller kit to force the valves open to 100%. I want more sound so I'm going full stainless Valvetronic exhaust....really hope I like it.

The M modes do more than just open the valves they also adjust the throttle sensitivity and traction control to whatever you set it at.

Our valve controller can lock the valve from 25-100%.

[Good 4 2 reasons]

Originally Posted by LeGoAuToPiLoT

Somebody please correct me if I'm wrong.....

The "M Sound" setting is for computer generated car sounds through the car audio. I had no idea until I realized what it was....and therefore once it was off, how quiet the stock exhaust on the car really is.

My understanding is that the "Sport Plus" Engine mode does several things; one of which is open the stock exhaust valves. But they're never fully open past 75% i think it is. And I've also heard that those valves adjust with speed as well. It's also possible that the "M Sound" becomes more pronounced when you change engine modes.

I know Dahler makes a separate exhaust valve controller kit to force the valves open to 100%. I want more sound so I'm going full stainless Valvetronic exhaust....really hope I like it.

M sound also activates the obnoxious burble tune for the engine in addition to the ASD sounds coming from the speakers, as well as increased exhaust valve opening.

[mike@x-ph.com]

Originally Posted by ohniner

Reading all the posts on G87 M2 exhaust (s) is downright exhausting (pun intended).
My new 2025 M2 has me confused, can't get a handle on real engine noise and how to control it vs ASD which I want to avoid.
In my M1 and M2 buttons I have turned off ASD but is there a flap operated exhaust system that activates under certain settings?
Do the drive modes activate ASD in some amount?
I've trolled the forum and google but cannot find a good explanation of the overall system, is there something out there?
all repossess welcomed.

the valves adjust depending on your RPM, speed, and mode.
If you want full control over the valves, you need a valve controller, it cannot be done just with M1 and M2

to get a real sound, get a valve controller and disable ASD using Bimemrcode or a similar app.

the burble sound is a personal preference that you can keep or also disable if you dont like it