[Vic55]

Originally Posted by ksa

I will research this more. I've done this in the past on other vehicles. I wonder if just removing that suitcase muffler at the very end does anything/much. Or I could leave that in and just remove the mid resonators. Doing both I think might make it too loud to be enjoyable as a daily.

My Alfa Romeo Giulia had mufflers removed and the shop said on turbo cars just mufflers out won't make a big difference and that was indeed the case on it. I didn't keep the car long so I didn't care but same concept on this in which case remove the mid-resonators might be the way to go for enhanced sound.

That and quad tips is all I would need. Haha.

Heard from quite a few that the suitcase at the end (removal) will cause drone and unwanted tonal exchanges.

[MacOSR]

I have my M5 in storage right now...I'll check it and take a picture to see if the m-performance exhaust truly does have the valves or not. It is MUCH louder if the valve button is switched on.

[Tenac]

Originally Posted by MacOSR

I have my M5 in storage right now...I'll check it and take a picture to see if the m-performance exhaust truly does have the valves or not. It is MUCH louder if the valve button is switched on.

It can be getting louder due to software as well. BMW does not control exhaust note 100% from valves it also de-tunes the burbles as well.

[Vic55]

Originally Posted by Tenac

It can be getting louder due to software as well. BMW does not control exhaust note 100% from valves it also de-tunes the burbles as well.

100%

Sport Plus has a greater impact than even the valving ... pops and burbles come from this operation.

[Demon Barber]

2018 M5 here with M performance exhaust. No valves. Zero. But, even with stock exhaust, the button DOES NOT directly open or close the valves, but rather decides on extra burbles on the overrun, and the computer decides when to open or close the valves based on RPM and sport/sport+ settings. The MPE sounds excellent, is not too loud, and burbles on overrun are still able to be killed by turning off the exhaust button. There has never been a topic with more misinformation than the MPE on these cars.

[ksa]

Originally Posted by Vic55

Heard from quite a few that the suitcase at the end (removal) will cause drone and unwanted tonal exchanges.

Ah ok. So mid resonator delete then? And then what, straight pipe? x pipe? What is the 'go to' for the best sound, but no drone and obnoxious shit.

[elitex]

I have the performance exhaust and it does not have valves. It’s a nice tone but not crazy loud so no issues with it not having valves.

[Vic55]

Originally Posted by ksa

Ah ok. So mid resonator delete then? And then what, straight pipe? x pipe? What is the 'go to' for the best sound, but no drone and obnoxious shit.

its gonna be a frankenstein approach IMHO ... I think Ill cut the rear cans and straight but possibly leave the rear coffee can.


Although this is just straight AF:

Wait-- look at 8 seconds in, the coffee can is there ...

[ksa]

I would think as long as you have the suitcase muffler at the way back it can't be that bad. If I get the time I am going to go to my exhaust shop to talk to them but basically if mid resonator is removed and replaced with either a straight pipe or x-pipe, it should definitely make it sound more aggressive than stock and with the suitcase muffler still in place, it would help avoid obnoxious aspect of the sound like drone etc.

[Vic55]

Originally Posted by ksa

I would think as long as you have the suitcase muffler at the way back it can't be that bad. If I get the time I am going to go to my exhaust shop to talk to them but basically if mid resonator is removed and replaced with either a straight pipe or x-pipe, it should definitely make it sound more aggressive than stock and with the suitcase muffler still in place, it would help avoid obnoxious aspect of the sound like drone etc.

I just spoke with Ben at RG--- he said with my valves wired wide open, the factory cans are basically thru and thru so removing them wont add much noise at all (mufflers). So that nixes that science project.

[ksa]

Lol...well then I am gonna wait and see other options as well. Is there a way or a module that would leave the flaps constantly open? This is on my M850 that is.

I had a mod like that on my Aston Martin Vantage and it made it so that with a click of the remote I could have the flaps open close (rather than relying on RPM range).

[Tenac]

Originally Posted by ksa

Lol...well then I am gonna wait and see other options as well. Is there a way or a module that would leave the flaps constantly open? This is on my M850 that is.

I had a mod like that on my Aston Martin Vantage and it made it so that with a click of the remote I could have the flaps open close (rather than relying on RPM range).

Yup, quick google search found this:

https://www.dinancars.com/products/e...arts/R660-0002

[Vic55]

Originally Posted by ksa

Lol...well then I am gonna wait and see other options as well. Is there a way or a module that would leave the flaps constantly open? This is on my M850 that is.

I had a mod like that on my Aston Martin Vantage and it made it so that with a click of the remote I could have the flaps open close (rather than relying on RPM range).

We wired the M8 valves wide open all the time--- this way I get a nice low rpm low end grunt too. Its a rather simple process:

Need 2 people
Rack car
Start car in sports plus with valves open (if you have this stuff)
Rev
2nd person ties the valves as they are open (zip lock LOL)
de rack car
Enjoy

Its weird how valving affects cars these days. With my 992 GTS the valves even in Sport/Sport Plus are semi closed at rpms under 5500 which is weird cause its not always possible to be at 5500 and over. I used an M Engineering tune to keep them open always and wow the gain in sound and tone is incredible.

[ksa]

Originally Posted by Tenac

Yup, quick google search found this:

https://www.dinancars.com/products/e...arts/R660-0002

Damn. Is this a thing? Why aren’t more people doing it or talking about it?

Does it not make a big difference! It would be compatible with all M850’s or was that flap exhaust optional?

[ksa]

Just looked up some DIY videos on the install of that valve remote control and dang sounds tedious lol. Need a lift for the car which is the biggest issue. Rest seems not too bad.

I recall on the Aston it was so simply and was basically removing a fuse from the fuse box in the trunk and installing the module.

[TupperBMW]

Originally Posted by Vic55

I just spoke with Ben at RG--- he said with my valves wired wide open, the factory cans are basically thru and thru so removing them wont add much noise at all (mufflers). So that nixes that science project.

Just to be clear, you are saying that wiring the valves open eliminate any benefit from a muffler delete?

I need to check out a diagram of this exhaust system. But I kinda have a hard time believing that, because when I’m in Sport mode and revving this thing hard I figure that valves are open, and it’s still quiet for my tastes.

I imagine that even with valves open, the exhaust gases must past through the muffler

I know that with the 992 Porsche they did

[TupperBMW]

I’m looking online and, correct me if I’m seeing this wrong, the M8 and 850i mufflers are way different from eachother. Looks like the 850 is a genuine suitcase whereas the M8 is a two piece muffler.

I have a hard time believing that taking out the giant muffler of the 850i and swapping in an X pipe won’t be a dramatic change to sound. Maybe less so with the way the M8 is set up?

[Vic55]

Originally Posted by TupperBMW

Just to be clear, you are saying that wiring the valves open eliminate any benefit from a muffler delete?

I need to check out a diagram of this exhaust system. But I kinda have a hard time believing that, because when I’m in Sport mode and revving this thing hard I figure that valves are open, and it’s still quiet for my tastes.

I imagine that even with valves open, the exhaust gases must past through the muffler

I know that with the 992 Porsche they did

I thought it would still get more sound but speaking with Ben who is an SME M expert r33_RGSport he said my gains from removing the cans wont make a big deal as the valves are wide open on my setup.

M valving is still dynamic much like the 992's and that does hinder sound even at reasonable rpms. I dont have that issue anymore.

[r33_RGSport]

M850 and M8 have 2 different muffler setup.

M8 muffler


M850 muffler


I never cut them open to see the internal, but in general the M8 side cans are the muffler. The middle one is to eliminate drone.
And the side muffler is valved where the valved one is pretty much a straight pipe when open.

While M850 muffler, generally it is chambered. With valve closed, the exhaust gas is routed to multiple chamber. When valve open, exhaust gas is through less chamber, but still collected in the main chamber.

[M8Bimmer]

Hey Ben
What is your opinion on that Dinan valve controller unit. Does or have you installed one?
Does anybody here use one?

[TupperBMW]

Thanks Ben. That illustrates it really well. Perhaps the M8 won’t be enhanced much from a muffler delete, but from how the M850i’s system is laid out, replacing that thing with an X pipe will probably be the bee’s knees

[ksa]

Originally Posted by TupperBMW

Thanks Ben. That illustrates it really well. Perhaps the M8 won’t be enhanced much from a muffler delete, but from how the M850i’s system is laid out, replacing that thing with an X pipe will probably be the bee’s knees

Are you talking about the mid resonator on the m850 or the big suitcase muffler at the very end? If you do end up doing it, please update us.