[M2joey]

Originally Posted by maddoc

So, I know that If I have Sterling put on my MPE and there's an issue they may have a fix for the rattle.

What clamp is the one that's coming loose?

Correct. My MPE was port installed also. Sounds like there have been issues with some port installs.

The clamp that connects the OEM cut pipe to the MPE pipe just before the bracket.

[cookiesowns]

Originally Posted by isjoey

Correct. My MPE was port installed also. Sounds like there have been issues with some port installs.

The clamp that connects the OEM cut pipe to the MPE pipe just before the bracket.

My rattle was caused by the exhaust pipe backing out from the clamp and causing quite a bit of sag, and it eventually got so bad to where the exhaust pipe sagged and caused contact with one of the center chassis braces... made for a nasty "rattle" on cold start.

It seems like they over torqued the clamp causing it to oval a bit and thus not get a solid bite.

I've pushed in my exhaust quite a bit and re-clamped the exhaust. 150+ miles with 0 rattles, it puuuuurs on cold start now.

My tips are all the way in, and both sides are much more even now!

[maddoc]

Originally Posted by isjoey

Correct. My MPE was port installed also. Sounds like there have been issues with some port installs.

The clamp that connects the OEM cut pipe to the MPE pipe just before the bracket.

Sounds like the best solution would be to weld flanges (if there's room)

[M2joey]

Originally Posted by maddoc

Sounds like the best solution would be to weld flanges (if there's room)

Turns out the latest fix has resulted in mega vibration sent through the cabin during every downshift from the exhaust now resting on the brace. I now have an appointment setup at my performance shop (RRT Racing) to have the exhaust welded, without flanges fyi. Should completely resolve the issue for good.

[maddoc]

Originally Posted by isjoey

Turns out the latest fix has resulted in mega vibration sent through the cabin during every downshift from the exhaust now resting on the brace. I now have an appointment setup at my performance shop (RRT Racing) to have the exhaust welded, without flanges fyi. Should completely resolve the issue for good.

Well, I may have to stop over at RRT and have them install and then welds the MPE.

[M2joey]

Originally Posted by maddoc

Well, I may have to stop over at RRT and have them install and then welds the MPE.

There you go!

[M2joey]

Originally Posted by maddoc

Well, I may have to stop over at RRT and have them install and then welds the MPE.

RRT welded my MPE today, rattle and vibration completely gone! Clearance from the bracket is better too. Looks like it should be fixed for good this time.

[ben_lzn]

My dealer tack welded the muffler clamp that "kept coming loose under hard driving". No more vibrations but drone is still there

[lax01]

Anybody got a picture of where they are welding it?

[nd2002]

Originally Posted by lax01

Anybody got a picture of where they are welding it?

It's around the edge of the door, underneath the car. It's where the MPE is hooked up to the OEM exhaust pipe. If you raise the car up, you should see the 2 pipes connected by a clamp.

You'll also see a kink in the MPE pipe that is directly above an aluminum brace, which is one of the locations for the rattles.

[trj3]

What a joke. I have the same thing. Back on the rack next weekend. Im wondering if the exhaust pipe that the MPE slides on to is too long and needs to be cut? I think that when we push the tips in and re tighten that all we are doing is moving the rear rubber swivel mounts that hang the muffler forward and that in a few miles they just rotate back to the posterior position. If the front pipe was cut shorter then it would hold the rear portion further forward and thus higher off of that support brace? Thoughts?

[Arnold_Powers]

Originally Posted by trj3

What a joke. I have the same thing. Back on the rack next weekend. Im wondering if the exhaust pipe that the MPE slides on to is too long and needs to be cut? I think that when we push the tips in and re tighten that all we are doing is moving the rear rubber swivel mounts that hang the muffler forward and that in a few miles they just rotate back to the posterior position. If the front pipe was cut shorter then it would hold the rear portion further forward and thus higher off of that support brace? Thoughts?

Honestly I don't know what the dealer did after I took it in but it hasn't loosened yet 1500 miles later. If I was doing it, honestly I would weld it together and forget about it

[M2joey]

Originally Posted by trj3

What a joke. I have the same thing. Back on the rack next weekend. Im wondering if the exhaust pipe that the MPE slides on to is too long and needs to be cut? I think that when we push the tips in and re tighten that all we are doing is moving the rear rubber swivel mounts that hang the muffler forward and that in a few miles they just rotate back to the posterior position. If the front pipe was cut shorter then it would hold the rear portion further forward and thus higher off of that support brace? Thoughts?

Just get it welded! Yes, if it is only .25" inch short the clamp will not hold it. The clamp only keeps the pipes in place, it does not put a lot of pressure on the pipes. I am not buying the "pushing the tips in" as the tips are literally ounces each, but maybe.

Went for a 200+ mile drive this past weekend, exhaust is fine. Which of course is what I would expect with it being welded.

[PGC]

Okay all,

Had the MPE fitted Friday 4th August 2017,
Cold start rattle is not great....only for approx 5 seconds but i believe there is also a slight resonance at certain RPM whilst driving.

Both of these scenario's are not acceptable on a high cost brand new installation, Can someone possibly post up some definitive images of where to weld so that i may fix this problem without out all the travelling and general grief involved in getting the dealer to cure!!.

Cheers

[Dimis]

I have the same issue as below and others in this post section, when i got the car there was only some very slight vibration coming from the end of the car near the tips on cold start only so i believe this has to do with pushing the tips all the way in as the instructions say and it will be solved.

Now after run in i went for a couple of spirited drives and initially there was no issue during the day however the next morning on cold start i got a massive vibration /rattle coming underneath the middle of the car but lasting only for the cold start once the car got warmed up the rattle /vibration was gone. I took the car to the dealer he said similar bs about clamp getting loose so i told them i don't want them to retighten the clamp and after a few spirited miles for it to come loose again i am looking for a permanent solution. Of course they didn't give a s... about what i told them and they just retightened the clamp and said its all sorted now it wont get loose again.

And here we are now after about 200 miles the initial rattle /vibration seems to be creeping in not as bad as the first time but i can feel it it will get worse after a track day or two. So i booked to have it sorted by an independent shop which i trust. They didn't advise welding straight away they said bring the car in we will lift it up wait for it to get cold and fire it to see where exactly the rattles /vibration are coming from.

If i get it sorted i will take pictures and post them lets see.

Originally Posted by PGC

Okay all,

Had the MPE fitted Friday 4th August 2017,
Cold start rattle is not great....only for approx 5 seconds but i believe there is also a slight resonance at certain RPM whilst driving.

Both of these scenario's are not acceptable on a high cost brand new installation, Can someone possibly post up some definitive images of where to weld so that i may fix this problem without out all the travelling and general grief involved in getting the dealer to cure!!.

Cheers

[Airic72]

I'm having same issue as others. Appointment with dealer on Sept 5th. Not an expert on this matter but he said he is aware of the issue and it has to do with the flap near the catilitic converter being stuck closed?. Let me know if this makes any sense. They have replaced 3 exhausts and believe mine will need replaced as well. I guess the valve is only open at cold start and the to close once catilitic converter is heated up? I'm not sure I'm buying this based on what I've read so far but throwing it out there. I'll report back what they find.

[lax01]

McKenna found that my MPE was nearly resting on the support brace (like 1MM of clearance) after 1050 miles (was in for the break-in service). They re-tightened and said there is now an inch of clearance. I don't hear the noise or feel any vibration now.

I'm assuming its going to loosen up again...is welding really the only option here?

[M2 Blur]

Originally Posted by M2 Blur

My cat back exhaust fixes to rattle have always been to remove any clamps, weld the sections and add an exhaust flex pipe to allow some movement. My last MPE on a 135 was to weld the clamp or remove the clamp and weld. My prior car needed a flex pipe to reduce vibration.

If I had this MP exhaust, I'd weld or bypass all clamps and add a flex pipe. The flex pipe allows the exhaust some flex and reduces vibration. BMW service is only going to do adjustments and to me is not a solution unless you want to keep coming back every time the problem reappears.

Go to a quality muffler shop. I've used Super Tuning Performance (San Fernando Valley). High quality work, done right on the spot and very reasonably priced. He'll do the mandrel bends, all stainless, resonator bypass... but any quality exhaust shop should be able to locate and take care of the rattle.

As for the drone? That's a different issue all together.

[cookiesowns]

Apparently tack welding is the solution BMW engineers recommended for the dealer.

[AndrewC1989]

i've got a fabspeed sport cat with a dinan resonator delete currently (on a stock muffler)

this is what it looks like under the car:





no vibration issues whatsoever. not sure why the MPE is such a pain in the ass. perhaps because the pipe is cut and clamped in a different location? are you guys all running stock cats? could it be an issue of too much back pressure? i've heard people say if they cold start with the valves open in race mode it doesn't vibrate.

[Dimis]

Ok i had mine done this weekend at the guys at Perfect Touch very highly recommended.

So as it was expected they found the issue which seems to be dealers who fit the exhaust do not cut the original pipe as much as they should in order for the exhaust to fit in place as a result where the clamp is you can see the exhaust pipe is not siting right. The solution simple cut another 10 mm or something like that until the exhaust sits perfectly on the braces issue solved have done about 40 miles hard driving and no issue since then rattle wise. Here below pictures for easy reference.

[Damage Inc]

Bumping this thread. My MPE is vibrating on cold start. Was at the dealer for a PPI. Asked the tech to look at it. He's super lazy and said it looked fine. Couldnt replicate since the car was warmed up.

What is the latest?