F15 X5 BMW M Performance Exhaust System

[originalgoods13]

Originally Posted by anacondatp

mpe sound is different than opening the flap because regular exhaust pipe is cut open inside and mpe is almost straight pipe with some perforated section to eliminate drone

Do you have a picture handy of the MPE cutout? I remembered an E90 discussion of the MPE but no one dared tear open a new MPE.

[anacondatp]

Originally Posted by originalgoods13

Do you have a picture handy of the MPE cutout? I remembered an E90 discussion of the MPE but no one dared tear open a new MPE.

there is no image of mpe cutout so no one knows exactly how it is designed. the best image is someone take a picture of how the pipe looks. other members have cut open the regular exhaust and found out there is no pipe inside. thats how all the sound was muffled. so they weld straight pipe inside leaving a small perforated section. and that sounds very similar to mpe. so i am just guessing that is how mpe is designed. and that is also different than removing the muffler and just do straight pipe because of the small section of perforated pipe inside the muffler that helps eliminate drone i think

[M302_imola]

Originally Posted by mrod81

Open the exhaust valve. It'll sound better...not MPE but better

Manually or via Bimmercode?

[mrod81]

Originally Posted by M302_imola

Manually or via Bimmercode?

BimmerLink 30 bucks but worth it plus the diagnostic info you get is pretty in depth

[anacondatp]

Originally Posted by mrod81

BimmerLink 30 bucks but worth it plus the diagnostic info you get is pretty in depth

the downside is it does not stay open forever. the valve closes when you turn off the car. so pretty much have to open on every startup

[mrod81]

Originally Posted by anacondatp

the downside is it does not stay open forever. the valve closes when you turn off the car. so pretty much have to open on every startup

Not with BimmerLink, it stays open. I had it that way for a month before I bought my MPE.

[anacondatp]

Originally Posted by mrod81

Not with BimmerLink, it stays open. I had it that way for a month before I bought my MPE.

i dont think so brother. i tested it and at least another guy on here confirmed the same thing. do this, open the valve. you will see smoke coming out of both exhaust pipes. drive around and turn off the car. the next day when you come out and do cold start, look to see if smoke comes out from both pipes or just the left side

[mrod81]

Originally Posted by anacondatp

i dont think so brother. i tested it and at least another guy on here confirmed the same thing. do this, open the valve. you will see smoke coming out of both exhaust pipes. drive around and turn off the car. the next day when you come out and do cold start, look to see if smoke comes out from both pipes or just the left side

You know I never took out my veepeak so maybe that's why? Idk. When I would log into the app it would ALWAYS say the flap was open but again I never took off the adapter.

[18BMWX5]

I have a 2018 X-Line. My lower valance has the trapezoid shaped tips not the circular shaped tips. My question is will my valance work with the MPE? Or, are the multiple trapezoid shaped valances?

[Kzang]

Originally Posted by 18BMWX5

I have a 2018 X-Line. My lower valance has the trapezoid shaped tips not the circular shaped tips. My question is will my valance work with the MPE? Or, are the multiple trapezoid shaped valances?

There are three different exhaust tips.

Basic/Xline/Luxury Line have the round tips for 35i
Msport line ( 35i and 50i ) have the Msport tips
50i have the upsside Msport designed tips but it is slightly thinner.

P.S. although lately I've seen 35i's with the 50i tips so this might have changed recently.

See attached photo illustration.

[M302_imola]

Originally Posted by mrod81

BimmerLink 30 bucks but worth it plus the diagnostic info you get is pretty in depth

Nice! Is it pretty straight forward because I'm far from a computer programmer?

[mrod81]

Originally Posted by M302_imola

Nice! Is it pretty straight forward because I'm far from a computer programmer?

There is a button on the top right, set it to open and you're done. Can't get easier than that.

[chanst3r]

Originally Posted by mrod81

There is a button on the top right, set it to open and you're done. Can't get easier than that.

So your saying that on my stock exhaust, I can just program the valve to be always open via bimmerlink?

Any downside to having open all the time? Loss of torque?

[Kzang]

Originally Posted by chanst3r

So your saying that on my stock exhaust, I can just program the valve to be always open via bimmerlink?

Any downside to having open all the time? Loss of torque?

Yep loss of pressure / torque..

[anacondatp]

Originally Posted by chanst3r

So your saying that on my stock exhaust, I can just program the valve to be always open via bimmerlink?

Any downside to having open all the time? Loss of torque?

Yes you can open the valve. It will not stay open after you turn off the car. You will need to use the app and open it everytime you start the car.

Loss of pressure is what someone said. I personally have not noticed the loss of pressure. But also I have never noticed the increase in sound ever...

[mrod81]

Originally Posted by chanst3r

So your saying that on my stock exhaust, I can just program the valve to be always open via bimmerlink?

Any downside to having open all the time? Loss of torque?

There's NO loss of pressure. It's for sound only. If you close it it keeps the sound quieter. Again there's NO loss of pressure if that were the case the MPE would also have the valve and it does not. Do you think they would make their performance muffler perform worse than the stock one?

As for the valve staying open it worked for ME I always had my Veepak on so maybe that was it. What you could do is open the valve then while it's open just disconnect the plug going that at the valve by the exhaust tip.

[18BMWX5]

Originally Posted by Kzang

There are three different exhaust tips.

Basic/Xline/Luxury Line have the round tips for 35i
Msport line ( 35i and 50i ) have the Msport tips
50i have the upsside Msport designed tips but it is slightly thinner.

P.S. although lately I've seen 35i's with the 50i tips so this might have changed recently.

See attached photo illustration.

Thanks for the illustration Kzang. From the factory I have the 35i X-Line with the 50i style tip. Seems like the MPE is the inverse shape. I have a Space Grey X5 and I did want to keep my valence as I like the simulated skid plate but I suppose I can order the updated version for the MPE. I appreciate the feedback.

[Kzang]

Originally Posted by mrod81

There's NO loss of pressure. It's for sound only. If you close it it keeps the sound quieter. Again there's NO loss of pressure if that were the case the MPE would also have the valve and it does not. Do you think they would make their performance muffler perform worse than the stock one?

As for the valve staying open it worked for ME I always had my Veepak on so maybe that was it. What you could do is open the valve then while it's open just disconnect the plug going that at the valve by the exhaust tip.

My understanding is.... Having the flap closed will increase exhaust back pressure and provide maximum torque at low revs. When the RPM increases during WOT, the engine passes the low to mid high torque range and the engine will require an extra exhaust flow to produce max power and this is the reason why the other flap opens up during higher RPM's.

For the 35i's when you start your car in the morning during cooler weather you will notice only the driver side is open... the passenger side opens up during hard acceleration or higher RPMs.

You can google this information for support.

[mrod81]

Originally Posted by Kzang

My understanding is.... Having the flap closed will increase exhaust back pressure and provide maximum torque at low revs. When the RPM increases during WOT, the engine passes the low to mid high torque range and the engine will require an extra exhaust flow to produce max power and this is the reason why the other flap opens up during higher RPM's.

For the 35i's when you start your car in the morning during cooler weather you will notice only the driver side is open... the passenger side opens up during hard acceleration or higher RPMs.

You can google this information for support.

Watch this...

This has been discussed lots of times...
It's closed mostly for noise reduction not back pressure...if that was the reason the MPE would 100% come with the valve as well...why would BMW want their performance exhaust to perform worse than the shitty stock one? It's open on WOT to allow exhaust out faster and perform better. Plus it's a little louder nothing like the MPE but definitely more than w it closed.

[mrod81]

Originally Posted by 18BMWX5

Thanks for the illustration Kzang. From the factory I have the 35i X-Line with the 50i style tip. Seems like the MPE is the inverse shape. I have a Space Grey X5 and I did want to keep my valence as I like the simulated skid plate but I suppose I can order the updated version for the MPE. I appreciate the feedback.

I have bought the MPE and mine came with these tips. You have the option of which tips to get for your specific X5

[ems328i]

Originally Posted by mrod81

This has been discussed lots of times...
It's closed mostly for noise reduction not back pressure...if that was the reason the MPE would 100% come with the valve as well...why would BMW want their performance exhaust to perform worse than the shitty stock one? It's open on WOT to allow exhaust out faster and perform better. Plus it's a little louder nothing like the MPE but definitely more than w it closed.

True dis. But funnily enough my wife complains that our 35i (stock) sounds louder on start up when cold than with the valve open - at least throatier. I like it!

[hufington]

It's a turbo engine; thus, no back pressure achieved thru the closed flap but the exhaust travel is longer and therefore it is quieter when flap closed. Shorter distance for exhaust gas to exit the system when open and less silencing achieved.