[thekronoschef]

Originally Posted by chicagofan00

I pulled fuses 218 and 203 this afternoon. I started the car up and both sides of the exhaust were working, I then waited for it to drop down below the 1k RPM mark and both sides continued to work. I didn't get a chance to drive it around yet so we'll see how it goes on this afternoon's commute.

This will be the first time driving it without ASD as well so I'm curious to see if I notice much of a difference or not. Personally, I never had much of an issue with ASD but since others on here have commented that it sounds much better without it, I figured I might as well pull the fuse while I was in there.

Thanks for the info. Was the cold start note noticeably different (better) with both sides open?

[BobsM3Coupe]

Originally Posted by Kozumasbullitt

you can see the valve position from the tailpipe with a flashlight.

I looked in the tailpipe with a flashlight and all I see is the curve of the inside of the pipe. No valve.

[chicagofan00]

Originally Posted by thekronoschef

Thanks for the info. Was the cold start note noticeably different (better) with both sides open?

It did seem a little louder to me but that could be just a placebo effect and me wanting to think it was louder. As others on here have said both flaps should be open on a cold start no matter what but it appears the valve closes typically within the first 30 seconds or so if the fuse is in place.

[SteveX3M40i]

Originally Posted by thekronoschef

Thanks for the info. Was the cold start note noticeably different (better) with both sides open?

Hi,
For us, cold start noise is identical - as both sides of the exhaust are working during startup phase.
Cheers
Steve

[thekronoschef]

Originally Posted by SteveX3M40i

Hi,
For us, cold start noise is identical - as both sides of the exhaust are working during startup phase.
Cheers
Steve

Thanks, Steve

[MechX3M40i]

Originally Posted by SteveX3M40i

Hi,
For us, cold start noise is identical - as both sides of the exhaust are working during startup phase.
Cheers
Steve

Is it possible that both sides open at start up (before fuse pull) is due to the warm climate?

[Roundel-NY]

I pulled the fuse this morning, and the left side is still not opening up... the car starts in the default Comfort mode.
I did pull the fuse a couple of days ago after driving, with the cat shut off, and nothing happened on restart, so I put the fuse back in until this morning. I am perplexed at the moment.

[SteveX3M40i]

Originally Posted by MechX3M40i

Is it possible that both sides open at start up (before fuse pull) is due to the warm climate?

Hi,
I guess it could be - current daytime temperature here is around 24 degrees C.
We don’t have the active grille on our car either.
Ours has always started loud - since we got it.
This happens even if you stop for fuel after a long journey and turn engine off.
If you start engine just a few minutes later - it starts loud again for 30 seconds - even though the engine is obviously up to normal running temperature.
Cheers
Steve

[MechX3M40i]

Originally Posted by SteveX3M40i

Hi,
I guess it could be - current daytime temperature here is around 24 degrees C.
We don't have the active grille on our car either.
Ours has always started loud - since we got it.
This happens even if you stop for fuel after a long journey and turn engine off.
If you start engine just a few minutes later - it starts loud again for 30 seconds - even though the engine is obviously up to normal running temperature.
Cheers
Steve

Thank you for the feedback. So essentially, the fuse pull did not do anything differently, at least for the Cold Start.

[SteveX3M40i]

Originally Posted by MechX3M40i

Thank you for the feedback. So essentially, the fuse pull did not do anything differently, at least for the Cold Start.

Hi,
No - we did it to ensure both sides of exhaust work all the time.
I believe that is better for exhaust life in the long term - as it will keep it hot and stop water condensing in the left hand side if it is only used occasionally.
It also means both sides will be equally clean or dirty!
Cheers
Steve

[nogren]

Originally Posted by SteveX3M40i

Hi,
No - we did it to ensure both sides of exhaust work all the time.
I believe that is better for exhaust life in the long term - as it will keep it hot and stop water condensing in the left hand side if it is only used occasionally.
It also means both sides will be equally clean or dirty!
Cheers
Steve

Isn't it so, that only one side is used to get the temperature up there quicker, to get better efficiency of the complete exhaust system? I am not worried that the other side will deteriorate.

[Kozumasbullitt]

Originally Posted by BobsM3Coupe

I looked in the tailpipe with a flashlight and all I see is the curve of the inside of the pipe. No valve.

You have to really get down there. You can see the side of the valve flap looking down the pipe from the outer edge. The picture below shows the flap completely open.

[SteveX3M40i]

Originally Posted by nogren

Isn't it so, that only one side is used to get the temperature up there quicker, to get better efficiency of the complete exhaust system? I am not worried that the other side will deteriorate.

Hi,
For 6 months of the year - our daily outdoor temperature is between 40 and 50 degrees C.
I don’t think we will have any trouble getting our engine and exhaust up to temperature!
I of course appreciate it’s a bit different in Sweden and other colder countries.
Cheers
Steve

[chicagofan00]

Originally Posted by SteveX3M40i

Hi,
I guess it could be - current daytime temperature here is around 24 degrees C.
We don't have the active grille on our car either.
Ours has always started loud - since we got it.
This happens even if you stop for fuel after a long journey and turn engine off.
If you start engine just a few minutes later - it starts loud again for 30 seconds - even though the engine is obviously up to normal running temperature.
Cheers
Steve

I've had the same experience so far. It will be a loud exhaust at start up for about the first 30 seconds while the RPMs hover just over 1k even if it was a cold start or a warm start. I do have the active grille. Pulling the fuse yesterday seems to have kept both sides open from what I can tell.

[nogren]

Originally Posted by SteveX3M40i

Hi,
For 6 months of the year - our daily outdoor temperature is between 40 and 50 degrees C.
I don’t think we will have any trouble getting our engine and exhaust up to temperature!
I of course appreciate it’s a bit different in Sweden and other colder countries.
Cheers
Steve

Google it. I believe we are talking about much higher temperatures.

[SteveX3M40i]

Originally Posted by nogren

Google it. I believe we are talking about much higher temperatures.

I know - I was just joking!

[BobsM3Coupe]

Originally Posted by Kozumasbullitt

You have to really get down there. You can see the side of the valve flap looking down the pipe from the outer edge. The picture below shows the flap completely open.

Thanks. I guess when I looked with the engine cold, the valve is closed, so I can't see the edge of the flap.
I'll have to check next time after I get back from a drive.

[j3rmyn]

Let the car run for like 5-10 minutes in sport mode to ensure both exhausts of open....while the engine is STILL on go into the back and pull fuse F203. Since then both exhausts have always been open. She screamssss at start up! Especially with the cold weather in NY

[RFernando]

When pulling the fuse do you get any kind of errors/notifications on your dash/iDrive going forward?

[chicagofan00]

Originally Posted by RFernando

When pulling the fuse do you get any kind of errors/notifications on your dash/iDrive going forward?

I have not received a single notification since pulling the fuses.

[Roundel-NY]

Originally Posted by j3rmyn

Let the car run for like 5-10 minutes in sport mode to ensure both exhausts of open....while the engine is STILL on go into the back and pull fuse F203. Since then both exhausts have always been open. She screamssss at start up! Especially with the cold weather in NY

This is what finally made both exhausts work for me. Previous attempts with waiting overnight had no effect.

Is it just me, or is there more exhaust noise when driving at highway speeds?

[dj_intrinsic]

On my way home, I just drove in sport plus. Right when I got into my garage, I jumped out of my car (still in sport plus and running) and made sure the flap was open by sticking my hand in front of the driver side exhaust tip to feel the warm exhaust. Once confirmed, I just pulled the plug right behind the tip to keep it flap from closing. I then turned off the car re-attached the plug but made sure to put some plastic wrap in between the plug and connector to prevent the circuit from closing. All done and the flap is always open with no codes.