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It's the telematics communication control module.

He's specifically talking about downshifting into 2nd.

This is my 4th BMW manual and I've never experienced that including on this car.

Just use a wheel repair shop/mobile service. That should be an easy fix.

Keep in mind whatever ceramic coating you use will make them slightly glossier. It won't be a huge difference but it is noticeable.

Yeah there is no reason you can't reinstall the CDV if needed.

Surprisingly replacing the amp did not fix the issue. They're going to try a software update next. If it's not that it has to be the head unit or wiring I guess. Edit: No luck on the update. They're waiting for a response from Toyota at the moment.

Not sure why you're so opposed to this mod when you haven't even experienced the difference first hand. It really is a huge improvement that's easily reversible if you don't like it for some reason.

Dealership agrees there is definitely something messed up since the distortion is extremely easy to hear with only the subwoofers playing any sound. I explained all of my troubleshooting steps and why I think it's probably the amp at this point. They took a video with the balance all the way...

I'm taking it to the dealer tomorrow with the interior already taken out so they can easily see what I'm talking about or swap speakers for themselves if needed. BMW has had some issues with amps in recent years so it wouldn't be too surprising. Just bad luck.

After swapping speakers, the drivers side always sounds worse regardless of speakers but neither are great. This is making me think the amp might be messed up.

Unless both subs were bad. It was a used one off ebay. I guess I need to take the other side of the car apart and swap speaker from side to side next.

I did some more testing and took the subwoofer driver out of the box while it was playing so it couldn't vibrate anything and the sound is 100% coming from the driver itself. At this point either both my original subwoofer and the one I bought are blown or there is something else going on. Any...

New subwoofer made no difference. Unplugging the ASD module made no difference. I have that whole side of the car torn apart at the moment and I still can't find where it's coming from. I guess the next step is to take the rear cross bar out. I need to go buy a T50 though. Edit: I took the...

Yes it's disabled via coding for me. The issue also persists whether the car is running or not.

Yeah that's why I'm not even bothering taking it back to the dealer this time. I'd rather roll the dice on a used ebay subwoofer than mess with the dealer. They gave it back to me sounding like shit last time so no reason to think they would do any better the second time.

I ordered a replacement stock one for now since my passenger side sub is fine. If that doesn't work I'll probably go this route. Thanks for the info.

Welp I just bought a used replacement from ebay for $80 so we'll see how it goes. I'll update you once I have that installed hopefully next week.

It's definitely NOT the small set of speakers behind my head. I have that taken out now and the sound is coming from the subwoofer area. I'm leaning toward the driver side subwoofer itself having a blown voice coil. Are you saying integral audio makes a replacement speaker that will fit in...

I forgot to post on here but the dealer did end up replacing that speaker finally (probably) and if anything just made matters worse. At this point I'm thinking there is just something vibrating behind one of those panels so I'm probably just going to tear it apart and fix it myself. It's bad...