[horsepower_and_hounds]

To help others with questions concerning the MPE here is my update

Now after having the MPE since Dec (3 mths & 2800 mi) and doing a hard hi speed mountain road runs here are my current comments.

Note: I have V2 with the exit pipe braces and slip over attaching interface.

The exhaust is awesome..... the way a BMW track car should sound. Not too loud and obnoxious....just right

Cost for me was reasonable since I didn't have to purchase tips. I purchased the exhaust from Sun Motorcars and had tips from previous F82

I run it in either sport with flaps open or comfort with flaps closed, why?

*Cuz when you run flaps open and in comfort for some reason there is more resonating thru the car at below 3500 rpm then there is with flaps open. Why, i have no friggin idea. You would think it is the other way around.

My car has the most pops/burbles in flaps open & sport, way more then in MDM & flaps open contrary what others are saying.

The fit was perfect the first time, install straight forward

The exhaust makes a little bit of HP proven with my dyno results 3-7hp aprox

The water drain hole in the bottom leaves a black trail up the back of the polished can FYI

Mine still has awful cold start vibration, but am used to it after having the F82 & MPE

My bluetooth connection has been working fine so far and has not dropped. I did do the install myself so know how it was put together

Feel free to ask any questions

[Downunder99]

Originally Posted by m2ruder

To help others with questions concerning the MPE here is my update

Now after having the MPE since Dec (3 mths & 2800 mi) and doing a hard hi speed mountain road runs here are my current comments.

Note: I have V2 with the exit pipe braces and slip over attaching interface.

The exhaust is awesome..... the way a BMW track car should sound. Not too loud and obnoxious....just right

Cost for me was reasonable since I didn't have to purchase tips. I purchased the exhaust from Sun Motorcars and had tips from previous F82

I run it in either sport with flaps open or comfort with flaps closed, why?

*Cuz when you run flaps open and in comfort for some reason there is more resonating thru the car at below 3500 rpm then there is with flaps open. Why, i have no friggin idea. You would think it is the other way around.

My car has the most pops/burbles in flaps open & sport, way more then in MDM & flaps open contrary what others are saying.

The fit was perfect the first time, install straight forward

The exhaust makes a little bit of HP proven with my dyno results 3-7hp aprox

The water drain hole in the bottom leaves a black trail up the back of the polished can FYI

Mine still has awful cold start vibration, but am used to it after having the F82 & MPE

My bluetooth connection has been working fine so far and has not dropped. I did do the install myself so know how it was put together

Feel free to ask any questions

"The exhaust is awesome..... the way a BMW track car should sound. Not too loud and obnoxious....just right" ... That is what I have been hoping for and when I get a chance to listen to the MPE sound live this Sunday, I hope I can make a final decision, so I can order the install at the VPC. I am surprised a little bit that BMW has not gotten the cold start vibration under control, it should not be the most difficult thing to fix, as they can simualte such things on a computer nowadays pretty well. And the black trail from the drain hole is not the nicest thing either. Nevertheless, what counts is the emotions from the sound of it Thanks for your report!

[horsepower_and_hounds]

Ok so an update to my update....

So as you know I have the resonating cold start noise. I started playing around with some things to try and lesson the cold start resonation. I tried pulling the exhaust back a bit to load the rubber hangers differently and left it over night to get a true cold start. Still the same, but I moved it back too far and upon full temp and exhaust expansion it touched heat shielding. Then I tried moving it far as possible forward...still the same on full cold start. So it is not caused by design of the hanging points and as you know the exhaust also has a flex joint after the down piped so that should also help dampen any vibration.

Well I remember someone commenting awhile back somewhere on here or the M4 forum about taking the tips off and trying it, I have the carbon-Ti tips. Well I took them off and it still vibrates but without the rattle resonating noise. It is a quiet vibration. So all this time with the F82 MPE and now the F87 MPE ( I have the same tips) the exhausts have always vibrated but the noise..... is being created with my M carbon titanium tips.

Interesting..... I still love it

[cookiesowns]

So here's your answer for the drone at 3K RPM in comfort but not sport.

In sport/sport+ modes the DME asks the EWG ( electronic wastegate ) to be closed, or at 99.99% Duty cycle until it needs to vent boost, this is for quicker spool times, vs when in comfort it's open until X amount of throttle input.

When the EWG is closed it means less exhaust flow through the pipes as it's being absorbed by the turbine wheels, thus producing what we like to call BOOOOOOOOOOST. That's why it's quieter

[qnet]

Thanks for the updates on your MPE. I've had my M2 for just under a week and am still undecided, but starting to lean toward this exhaust again.

[BMWPWR18]

edit, didn't notice you already tried cold start with tips removed

[MR_M2]

@m2ruder does yours feel louder after 2800 miles? I put around 4000 and it feels like it has gotten louder. Also, the dealership kinda fixed the rattle issue by pushing the exhaust in by about 3 inches. The cold rattle is now gone, with the only downside being that the exhaust tips sit about 0.5 inches behind the diffuser.

[horsepower_and_hounds]

Originally Posted by MR_M2

@m2ruder does yours feel louder after 2800 miles? I put around 4000 and it feels like it has gotten louder. Also, the dealership kinda fixed the rattle issue by pushing the exhaust in by about 3 inches. The cold rattle is now gone, with the only downside being that the exhaust tips sit about 0.5 inches behind the diffuser.

Not really...I spend almost all the time in flaps open mode. I have not noticed any tone change as of yet

[voyagergab]

Originally Posted by MR_M2

@m2ruder does yours feel louder after 2800 miles? I put around 4000 and it feels like it has gotten louder. Also, the dealership kinda fixed the rattle issue by pushing the exhaust in by about 3 inches. The cold rattle is now gone, with the only downside being that the exhaust tips sit about 0.5 inches behind the diffuser.

Please forgive a silly question. How do you push the exhaust back? I was poking my head under the back of the car and I see the hangers and that's about it.

I was curious as the tips on the driver side stick out marginally further.

[horsepower_and_hounds]

Originally Posted by voyagergab

Please forgive a silly question. How do you push the exhaust back? I was poking my head under the back of the car and I see the hangers and that's about it.

I was curious as the tips on the driver side stick out marginally further.

The tips have a set screw under the bottom, you slide them forward or back on the exhaust outlets independently of the actual exhaust.

Not if you have Ver 2 of the exhaust the attaching point on the stock pipe has a slip over joint and I tried pulling it back then pushing it forward to change the load on the hanger rubbers bit it was useless. To align your tips just slide them forward or back then re-tighten the set screw

Not sure what MR_M2 is referencing in his comment whether it was the actual exhaust they slid in to the tips. If the physically pushed the exhaust forward 3in then it would be against the forward wall so it might be the tips

[voyagergab]

Originally Posted by m2ruder

The tips have a set screw under the bottom, you slide them forward or back on the exhaust outlets independently of the actual exhaust.

Not if you have Ver 2 of the exhaust the attaching point on the stock pipe has a slip over joint and I tried pulling it back then pushing it forward to change the load on the hanger rubbers bit it was useless. To align your tips just slide them forward or back then re-tighten the set screw

Thanks very much for the tip on the tips!
Is that joint closer to the front of the car?
I recall seeing a roller type of thingy there.
How do I tell if I have v2?
My car was an October 2017 build and the MPE was port installed.

[horsepower_and_hounds]

Originally Posted by voyagergab

Thanks very much for the tip on the tips!
Is that joint closer to the front of the car?
I recall seeing a roller type of thingy there.
How do I tell if I have v2?
My car was an October 2017 build and the MPE was port installed.

Oct 2017 you should have Ver 2. There should be a bracket between the exit pipes on each side. Something that looks like a clamp that keeps then from vibrating, with a tightening screw in the middle. The slip joint is um just past the tunnel cross brace. You can see it if you look under the car...there is a clamp

[F87_LCI]

Do you have an aftermarket DP? I have a Fabspeed Sportcat...and the Drone Zone (2800-3200) is horrible...in any mode to be honest but is worst when in traction mode with flaps open...which is sad since this is the combo that often has bystanders diving behind bushes, lol

[voyagergab]

This bracket?

[horsepower_and_hounds]

Nope no DP...and as for the traction mode (MDM) it is not louder on my car. Sport is louder and has more crackles on mine with the MPE then MDM.

MDM mode might give you more on the stocker but not mine with the MPE

[horsepower_and_hounds]

Originally Posted by voyagergab

This bracket?

Yes sir that be it

[voyagergab]

Originally Posted by m2ruder

Yes sir that be it

Thanks very much.
I personally didn't notice an issue with cold start vibrations.
Only the 3k drone bugs me.

[horsepower_and_hounds]

My tips are pretty old, they were on the M4 for 20k miles before coming over to the M2

[alscks0414]

Originally Posted by F87_LCI

Do you have an aftermarket DP? I have a Fabspeed Sportcat...and the Drone Zone (2800-3200) is horrible...in any mode to be honest but is worst when in traction mode with flaps open...which is sad since this is the combo that often has bystanders diving behind bushes, lol

Hey,

I dont know if this will help much but as i installed and experienced both Fabspeed and Akra. The drone is felt less with Akra compared to Fabspeed. Not sure if that is because if 200-cell HJS in Fab compare to 300-cell HJS with Akra. I believe cell would not play any possible role making difference in drone but it does seem to be reduced noticeably. I changed them because i was looking for less emission making option but still wished to have better sound compared to the stock DP. (I have MPE as well) My wife was complaining abt the CO2 comes from the car compared to stock one although i did not feel much difference. She was concerned abt our 2 yr old daughter.

I know u live close by but if u wish to see the difference we can meet up at some point. It could be just me feeling that way but u can ay least have a chance to compare urs and mine. I dont have any stage ECU or turbo tuning or intakes installed yet. Soon will be doing some mods after this year with some dinan stuff

I will be away from GTA and returning around first week of April. PM me if u r interested meet and discuss. I think it would be fun

[F87_LCI]

Originally Posted by alscks0414

I will be away from GTA and returning around first week of April. PM me if u r interested meet and discuss. I think it would be fun

Thanks for the info and the offer...will PM you.

[seis-speed]

Originally Posted by m2ruder

Yes sir that be it

That bracket = version 2

???