Do the carbon fiber exhaust tips rattle?

[Super Spartan]

I saw a few posts about people with the MPE complaining that the carbon fiber exhaust tips rattle sometimes.

Now I ordered a 2018 M4 with the competition pack and the front carbon fiber splitters + rear carbon fiber diffusor.

I was gonna order the rear carbon fiber exhaust tips but this made me not want to go with them...

So my question is:

1) Do the carbon fiber exhaust tips really rattle? how about if they were installed on the Sports Exhaust on the Competition Pack M4 and not on the MPE?

2) Will the carbon fiber exhaust tips fit on the sports exhaust or are they just for the MP3?

3) If I do get them, will it be ok to use them if I do order the MPE in the future? (I know this is a dumb question but just want to make sure)

[Arcades]

Originally Posted by Snappy Phoenix

I saw a few posts about people with the MPE complaining that the carbon fiber exhaust tips rattle sometimes.

Now I ordered a 2018 M4 with the competition pack and the front carbon fiber splitters + rear carbon fiber diffusor.

I was gonna order the rear carbon fiber exhaust tips but this made me not want to go with them...

So my question is:

1) Do the carbon fiber exhaust tips really rattle? how about if they were installed on the Sports Exhaust on the Competition Pack M4 and not on the MPE?

2) Will the carbon fiber exhaust tips fit on the sports exhaust or are they just for the MP3?

3) If I do get them, will it be ok to use them if I do order the MPE in the future? (I know this is a dumb question but just want to make sure)

Uhh, i think it has been mentioned enough times on the forums I believe soo...

1. The rattles are from the valves on cold start on MPE. It varies from system to system but it is generally from the valves. If the tips are rattling then it wasn't installed correctly.

2. No. MPE tips are for MPE only.

3. ? You cannot backwards fit MPE Exhaust tips to a regular F8x sport exhaust. It doesn't work that way. There is a diameter difference between regular F8x exhausts and the MPE exhaust. Just like normal aftermarket exhausts are generally larger than MPE exhaust. For example. my Akrapovic Evolution tips are 98mm, the MPE tips are only 90mm (or close to that). You cannot fit them even if you clamp it since it isn't the right size.

[Super Spartan]

Originally Posted by Arcades

Uhh, i think it has been mentioned enough times on the forums I believe soo...

1. The rattles are from the valves on cold start on MPE. It varies from system to system but it is generally from the valves. If the tips are rattling then it wasn't installed correctly.

2. No. MPE tips are for MPE only.

3. ? You cannot backwards fit MPE Exhaust tips to a regular F8x sport exhaust. It doesn't work that way. There is a diameter difference between regular F8x exhausts and the MPE exhaust. Just like normal aftermarket exhausts are generally larger than MPE exhaust. For example. my Akrapovic Evolution tips are 98mm, the MPE tips are only 90mm (or close to that). You cannot fit them even if you clamp it since it isn't the right size.

Thanks a lot for the detailed answer. I really appreciate it

[Lojs]

My carbon tips rattle... a lot. Its annoying. And I cant figure out a way to fix it. I have tried pressing them fully onto the exhaust pipes and I have also tried bringing them outwards, still rattles. I have tried tightening the screws, no improvement. The worst is when you go up a ramp (underground parking) at very low rpm in 2nd, the engine resonates more and shakes the exhaust.

If I take them off and drive without rattle is gone. So it is surely not valves. My MPE is 1,5 years old, and it has become worse in the last year.

I assume it has something to do with the design: the mounting (screw fixing) point is quite far from edge of the two sleeves that slide into/over the exhaust pipe. That must result in some resonance.

I have no idea if the titanium (i.e. non carbon) tips have a similar design and have similar issues.

[Super Spartan]

Originally Posted by Lojs

My carbon tips rattle... a lot. Its annoying. And I cant figure out a way to fix it. I have tried pressing them fully onto the exhaust pipes and I have also tried bringing them outwards, still rattles. I have tried tightening the screws, no improvement. The worst is when you go up a ramp (underground parking) at very low rpm in 2nd, the engine resonates more and shakes the exhaust.

If I take them off and drive without rattle is gone. So it is surely not valves. My MPE is 1,5 years old, and it has become worse in the last year.

I assume it has something to do with the design: the mounting (screw fixing) point is quite far from edge of the two sleeves that slide into/over the exhaust pipe. That must result in some resonance.

I have no idea if the titanium (i.e. non carbon) tips have a similar design and have similar issues.

That isn't very promising me and makes me not want to upgrade to the MPE to be honest. I heard in that same thread where I heard people complaining about the rattling in the carbon fiber exhaust tips, that when they switched to the titanium tips the rattling went away. But then, that makes them not look so great in combination with the rear carbon fiber diffusor.

I will look into getting an Akrapovic exhaust in the future.

[SD ///M4]

Originally Posted by Snappy Phoenix

That isn't very promising me and makes me not want to upgrade to the MPE to be honest. I heard in that same thread where I heard people complaining about the rattling in the carbon fiber exhaust tips, that when they switched to the titanium tips the rattling went away. But then, that makes them not look so great in combination with the rear carbon fiber diffusor.

My CF tips don't rattle. I mounted them myself and the set screw holds them on firmly. They're already a snug fit before you tighten the set screw so I don't see how they could rattle.

You're right about how they look with a CF Rear Diffuser though. I was in Monterey for Monterey Car Week when the M4 Concept was unveiled in August 2013. That car had the MPE with CF tips and the CF Rear Diffuser. I have a photo taken from the rear and I knew that if and when the M4 was released and if and when I owned one, I wanted it to look just like that. And now it does!

[Super Spartan]

Originally Posted by SD ///M4

My CF tips don't rattle. I mounted them myself and the set screw holds them on firmly. They're already a snug fit before you tighten the set screw so I don't see how they could rattle.

You're right about how they look with a CF Rear Diffuser though. I was in Monterey for Monterey Car Week when the M4 Concept was unveiled in August 2013. That car had the MPE with CF tips and the CF Rear Diffuser. I have a photo taken from the rear and I knew that if and when the M4 was released and if and when I owned one, I wanted it to look just like that. And now it does!

man that looks wicked! carn porn!

[Lojs]

Originally Posted by SD ///M4

My CF tips don't rattle. I mounted them myself and the set screw holds them on firmly. They're already a snug fit before you tighten the set screw so I don't see how they could rattle.

You're right about how they look with a CF Rear Diffuser though. I was in Monterey for Monterey Car Week when the M4 Concept was unveiled in August 2013. That car had the MPE with CF tips and the CF Rear Diffuser. I have a photo taken from the rear and I knew that if and when the M4 was released and if and when I owned one, I wanted it to look just like that. And now it does!

I have the same color, diffuser, tips combo. Visually I love it.
But the rattling spoils the fun. Maybe there is some minor deformation due to prolonged heat since I track. No idea.

Btw the pic you posted has slightly different tips than in reality: these are shine (chrome?) and don't have perforation (holes) inside the pipe.

[Lojs]

Originally Posted by Snappy Phoenix

That isn't very promising me and makes me not want to upgrade to the MPE to be honest. I heard in that same thread where I heard people complaining about the rattling in the carbon fiber exhaust tips, that when they switched to the titanium tips the rattling went away. But then, that makes them not look so great in combination with the rear carbon fiber diffusor.

I will look into getting an Akrapovic exhaust in the future.

If i were you I would be more concerned with the titanium weld splitting on the side of the exhaust can issue that people are having around here. (not me though)
I am sure you have seen the thread.

[Super Spartan]

Originally Posted by Lojs

I am sure you have seen the thread.

I haven't actually.........seems like BMW cannot make a perfect exhaust/tips anymore?

Just thinking of going Akrapovic and be done with it

[Lojs]

Originally Posted by Snappy Phoenix

I haven't actually.........seems like BMW cannot make a perfect exhaust/tips anymore?

Just thinking of going Akrapovic and be done with it

MPE muffler can splitting on sides? http://f80.bimmerpost.com/forums/sho....php?t=1296326

[Super Spartan]

Originally Posted by Lojs

MPE muffler can splitting on sides? http://f80.bimmerpost.com/forums/sho....php?t=1296326

oh yeah that's the one I've seen. Thanks

[SD ///M4]

Originally Posted by Lojs

I have the same color, diffuser, tips combo. Visually I love it.
But the rattling spoils the fun. Maybe there is some minor deformation due to prolonged heat since I track. No idea.

Btw the pic you posted has slightly different tips than in reality: these are shine (chrome?) and don't have perforation (holes) inside the pipe.

I track my car too, in fact I've had 8 track days since I installed the MPE last summer. At Laguna Seca I got too far over the curbing on an apex, bottomed out, and knocked the CF tip askew. I had to loosen the set screw and realign the tip. Still doesn't rattle.

Regarding the pics, these were from the M4 Concept Coupe in August 2013, two years before the M4 was released, so they were probably a mock-up of what they were planning. In fact, I have it on good authority that the chassis underneath the concept body was actually a 428i! And the color on the concept car was called "Aurum Dust" by BMW, although it looks a lot like Austin Yellow.

[einscot]

random - but can the ZCP black tips be fitted to the MPE exhaust? in other words, are you forced to buy either the titanium or carbon fiber tips to run the MPE?

let me edit this to say - a local dealer was insisting they were, and i was highly skeptical. figured it was a way for them to get it up on the lift, then tell me it wasn't and i'd be stuck ordering other tips or having to go back to the original set up

[Lojs]

Originally Posted by einscot

random - but can the ZCP black tips be fitted to the MPE exhaust? in other words, are you forced to buy either the titanium or carbon fiber tips to run the MPE?

I can only speak of non-ZCP OEM tips (since that is what I had) they are fixed permanently. I would assume the black ZCP ones have same design.
And no, BMW won't sell you an MPE without their tips. (there is always an exception to every rule, if you know some people that know some people) but I have yet to see a decent aftermarket tip that fits MPE.

[einscot]

Originally Posted by Lojs

I can only speak of non-ZCP OEM tips (since that is what I had) they are fixed permanently. I would assume the black ZCP ones have same design.
And no, BMW won't sell you an MPE without their tips. (there is always an exception to every rule, if you know some people that know some people) but I have yet to see a decent aftermarket tip that fits MPE.

thanks - i sort of assumed they weren't compatible either way since i knew the MPE tips wouldn't fit the sports exhaust (zcp stock), but the dealer here thought otherwise.

[Arcades]

Originally Posted by einscot

thanks - i sort of assumed they weren't compatible either way since i knew the MPE tips wouldn't fit the sports exhaust (zcp stock), but the dealer here thought otherwise.

ZCP and non-ZCP exhaust are the same (technically). Just inside the exhaust and the ZCP change makes them different (I'm taking an educated guess). Outside design wise they are the same (aside from the color of the tips.)

That is it. MPE tips are still wider than stock, ZCP or non-ZCP so no, you cannot fit the tips to Stock exhaust from MPE.

Of course you can always make it happen if you're desperate enough but design wise they aren't supposed to be meshed together.

[alz0rz]

Originally Posted by Lojs

I can only speak of non-ZCP OEM tips (since that is what I had) they are fixed permanently. I would assume the black ZCP ones have same design.
And no, BMW won't sell you an MPE without their tips. (there is always an exception to every rule, if you know some people that know some people) but I have yet to see a decent aftermarket tip that fits MPE.

You can remove OEM non ZCP and ZCP tips. They are not fixed permanently.

[ssgm1x]

On my 2018 M3 with m performance exhaust and carbon fiber mpe tips it is 100% the tips that rattle. I will be removing them and replacing them with new ones or different ones. BMW Dealer has also confirmed that the sound is also coming from the carbon tips...Ugh...