MPe muffled and quiet after 45 minutes

[LuckyTune]

Hi all - wondering if anyone can shed some light..

I drove from Sydney to Canberra on the weekend, and by the time I arrived in Canberra the sound of my exhaust had completely changed - it sounded totally muffled and had lost all the rasp - since the trip when the car/exhaust is warmed up it is sounding the same, totally different to how it used to be (sounds almost like a standard exhaust again)

Setup
2016 F80 ZCP
MPe with about 11,000kms
Valve controller

I have checked to make sure the valves are open and can't think of anything else that could be causing this - any ideas?

[F80Moe]

MPE muffler is prone to crack..

Inspect the rear section since such issue may cause change in sound

http://f80.bimmerpost.com/forums/sho....php?t=1296326

[LuckyTune]

Originally Posted by F80Moe

MPE muffler is prone to crack..

Inspect the rear section since such issue may cause change in sound

http://f80.bimmerpost.com/forums/sho....php?t=1296326

I would think a crack would make it louder and more raspy though?

[drgmt]

Originally Posted by LuckyTune

I would think a crack would make it louder and more raspy though?

There have been failures reported with the muffler itself unrelated to cracking.

[LuckyTune]

Originally Posted by Modaddict79

There have been failures reported with the muffler itself unrelated to cracking.

Going to get it inspected next week - out of warranty so no real point dealing with BMW at this stage.

Is there any easy way to tell if there might be an internal/baffling issue without opening it up?

[drgmt]

Originally Posted by LuckyTune

Going to get it inspected next week - out of warranty so no real point dealing with BMW at this stage.

Is there any easy way to tell if there might be an internal/baffling issue without opening it up?

If there is no cracking then it's almost certainly a baffling issue.

Even if it's out of warranty - if you bought it from BMW I would give it a try - there are known issues with this exhaust and they might be willing to cover it. No harm in trying.

[LuckyTune]

Originally Posted by Modaddict79

If there is no cracking then it's almost certainly a baffling issue.

Even if it's out of warranty - if you bought it from BMW I would give it a try - there are known issues with this exhaust and they might be willing to cover it. No harm in trying.

Bought used, so i'll see how i go..

Essentially trying to rule everything out before i get it opened up - the change did coincide with the software in the car being updated to solve a bluetooth issue so i'm racking my brain to figure out how and if this could have affected it

[danniexi]

valves are probably stuck (closed)? double check looking through the tips with a flash light. very easy to tell.

my valves were stuck as well (but open, which rattled like hell).

[LuckyTune]

Originally Posted by danniexi

valves are probably stuck (closed)? double check looking through the tips with a flash light. very easy to tell.

my valves were stuck as well (but open, which rattled like hell).

Checked the valves, they are opening and closing correctly

[LuckyTune]

Just checked - no cracks, looks brand new!

[drgmt]

Originally Posted by LuckyTune

Just checked - no cracks, looks brand new!

It might be a problem with the baffles.

Stuart from BMR had a customer with this exact problem. Reach out to him with a PM

[LuckyTune]

Originally Posted by Modaddict79

It might be a problem with the baffles.

Stuart from BMR had a customer with this exact problem. Reach out to him with a PM

Thanks, PM sent