OEM Exhaust Mod DONE - HOLY Crap

[cgoldie187]

Just got the OEM mod done to my E92 today at **********s. Awesome service and for $625 I thought it was a steal.

I will post videos soon. The sound is perfect, not too loud, zero drone, just wow.

For future if you're getting this done, have them remove the fiberglass for good, do not put it back in. It deadens the sound too much.

The mod they did was just replacing the perf pipes with solid pipes

[timothy2001]

Nice, and good to hear. This is my next mod happening as soon as my exhaust tips arrive.

[olaf m3]

Drones, unless you put the dog hair back in?

[cgoldie187]

Originally Posted by olaf m3

Drones, unless you put the dog hair back in?

I can't notice any drone when I drove home. Then again I wanted the car louder in all aspects, so I dont mind a little drone.

[BOOF-M3]

Originally Posted by olaf m3

Drones, unless you put the dog hair back in?

That is exactly right. I had mine done and my exhaust guy saved me as I asked him to completely remove it and he said not unless you want you want to hear a choir humming in your ears through most every speed. But you make a good point Goldie, if you like LOUD then you must be loving your exhaust. Awesome bruh.

[Helmsman]

Goldie, all 4 pipes or just 2?

[boba-fett]

I have the 2.5 mod done and its bloody loud, but just perfect.

[KicknShift]

No drone you say? Seems too good to be true.
This is going to be the first mod I do once I get my M.
Any reason why it came out to be so expensive?
I was searching around this forum and saw people were paying between 300-400.

[boba-fett]

Originally Posted by KicknShift

No drone you say? Seems too good to be true.
This is going to be the first mod I do once I get my M.
Any reason why it came out to be so expensive?
I was searching around this forum and saw people were paying between 300-400.

In the UK its around £150 so about 170 US is about right unless they are doing the exhaust removal and refit as well, which is about £250 job done.

Its the best cheapest mod you can do to the V8

[Helmsman]

Originally Posted by boba-fett

I have the 2.5 mod done and its bloody loud, but just perfect.

Had 2 pipe since 3 years now, happy but thinking about a tad more sound. Either open this box and go "2.5" or full 4 pipe, but also looking at another box. Borla seems very nice but tricky/expensive over here due to shipping/tax.

[nydog]

Originally Posted by cgoldie187

Just got the OEM mod done to my E92 today at **********s. Awesome service and for $625 I thought it was a steal.

I will post videos soon. The sound is perfect, not too loud, zero drone, just wow.

For future if you're getting this done, have them remove the fiberglass for good, do not put it back in. It deadens the sound too much.

The mod they did was just replacing the perf pipes with solid pipes

I love the sound of my M since doing this last year. I left the insulation in though.

[///M Power-Belgium]

Originally Posted by BOOF-M3

That is exactly right. I had mine done and my exhaust guy saved me as I asked him to completely remove it and he said not unless you want you want to hear a choir humming in your ears through most every speed. But you make a good point Goldie, if you like LOUD then you must be loving your exhaust. Awesome bruh.

The Oem. exhaust without the fiberglass sounds too hollow , and that really s@cks for the sound quality !
Good sound quality requires the fiberglass for a deeper tone and without drone .
Louder is not always better , we need to think about the sound quality as well !
I did my Oem.exhaust by myself , and I tested it with and without fiberglass ...
Actually I was happy that I could put all the fiberglass back in .
Note: I have done the 2 big perforated pipe replacement.

[GORDON.M3]

Originally Posted by ///M Power-Belgium

The Oem. exhaust without the fiberglass sounds too hollow , and that really s@cks for the sound quality !
Good sound quality requires the fiberglass for a deeper tone and without drone .
Louder is not always better , we need to think about the sound quality as well !
I did my Oem.exhaust by myself , and I tested it with and without fiberglass ...
Actually I was happy that I could put all the fiberglass back in .
Note: I have done the 2 big perforated pipe replacement.

+1

Put the fiberglass back in. It sounds amazing, I have the 2-pipe done on my car and with all the fiberglass back in, the car sounds real exotic throughout the RPM range. It gives the S65 a really nice sound signature. I agree, loud isn't always better!

[BimmerRookie]

If OP replaced all pipes with solid pipes, would the fiberglass material make a difference? It's effectively straight-piped all the way through....Somebody help me understand...

[cgoldie187]

Originally Posted by BimmerRookie

If OP replaced all pipes with solid pipes, would the fiberglass material make a difference? It's effectively straight-piped all the way through....Somebody help me understand...

The tech told me that the fiberglass only reduces the noise for inside the car, i.e. reduces drone

[GORDON.M3]

Originally Posted by BimmerRookie

If OP replaced all pipes with solid pipes, would the fiberglass material make a difference? It's effectively straight-piped all the way through....Somebody help me understand...

The fiberglass helps keep the exhaust from making more noise inside your cabin. Meaning if you had it removed, you would hear the drone and rumble coming from the rear-end. If you had kept the mesh pipe and removed the fiberglass then you would have a different sound both inside and outside.

[///M Power-Belgium]

Originally Posted by BimmerRookie

If OP replaced all pipes with solid pipes, would the fiberglass material make a difference? It's effectively straight-piped all the way through....Somebody help me understand...

Yes the fiberglass would make a difference between drone and no drone and sound too hollow or just perfect .

You are clearly confused in the situation..
Replacing all 4 pipes ( 2 big + 2 small ) is not the straight through method.
Straight through is actually the ACM method where the Helmholtz chambers are deleted , because the straight through method goes through the Helmholtz chambers.

And the 2 big pipe or all 4 pipes replacement is in the middle of the absorption chamber in the middle section of our canister
It is in the absorption chamber where the perforations in the pipes are located.
Helmholtz is designed by BMW for anti-drone .That's why straight through will drone .

Here a drawing from our canister , and if you still don't understand just shoot your question to me for more specific information .

[BimmerRookie]

Originally Posted by ///M Power-Belgium

Yes the fiberglass would make a difference between drone and no drone and sound too hollow or just perfect .

You are clearly confused in the situation..
Replacing all 4 pipes ( 2 big + 2 small ) is not the straight through method.
Straight through is actually the ACM method where the Helmholtz chambers are deleted , because the straight through method goes through the Helmholtz chambers.

And the 2 big pipe or all 4 pipes replacement is in the middle of the absorption chamber in the middle section of our canister
It is in the absorption chamber where the perforations in the pipes are located.
Helmholtz is designed by BMW for anti-drone .That's why straight through will drone .

Here a drawing from our canister , and if you still don't understand just shoot your question to me for more specific information .

Thanks for that, but I'm wondering if the fiberglass will make a difference if it's just straight piped all the way through? The fiberglass would be doing no sound absorption, unless it's in there to absorb vibration as well... Isn't Helmholtz, just the use of an auxiliary chamber with perforated pipes to allow sound to exit the pipe, run through the fiberglass, and then back out (essentially, allowing sound to travel further through different mediums)?

How is ACM any different than 4 pipe method? Effectively, ACM is just bypassing 4 inner pipes, correct? So in effect, 4 pipe = ACM?

[BimmerRookie]

Wait a minute, does the Helmholtz chamber house an exit for the exhaust? Meaning, before the bend, does the exhaust exit into that chamber? Maybe that's where I'm getting tripped up..

[///M Power-Belgium]

Originally Posted by BimmerRookie

Thanks for that, but I'm wondering if the fiberglass will make a difference if it's just straight piped all the way through? The fiberglass would be doing no sound absorption, unless it's in there to absorb vibration as well... Isn't Helmholtz, just the use of an auxiliary chamber with perforated pipes to allow sound to exit the pipe, run through the fiberglass, and then back out (essentially, allowing sound to travel further through different mediums)?

How is ACM any different than 4 pipe method? Effectively, ACM is just bypassing 4 inner pipes, correct? So in effect, 4 pipe = ACM?

ACM (straight through) goes straight through the Helmholtz chamber , pipes are cut for the absorption chamber and so the Helmholtz chamber doesn't works anymore .
This method is the loudest but will drone .

The 2 big or all 4 pipe replacement is only in the absorption chamber to replace the perforated areas of the pipes .
The Helmholtz chamber is not touched with this method and stays intact and functional for anti-drone .
Fiberglass will make difference , you ever screamed through a hollow barrel ?

[thkfast]

I had the muffler guy replace the 2 big perforated sections with straight pipe, pulled back the steel wool wrapping a little off the smaller perforated sections and then replaced the insulation.

The whole process took 1.5 hrs and I was charged $170. I'm very happy with the sound, but at 75-80 mph the engine is revving so high there's a constant high pitched exhaust note you can't ignore. But at least I can hear the exhaust now!

[timothy2001]

Not to be beating a dead horse into the ground but in simplest terms the process is replacing two larger perforated section of pipes with two non-perforated sections, replacing the fiberglass and done.

I will be having this done along with exhaust tips in the next few weeks and just want to be sure.