[ahakanc90]

Looks like a decent deal and it is official BMW. Wondering about the labor cost if installed at the dealer.

[Neusser]

Originally Posted by ahakanc90

Looks like a decent deal and it is official BMW. Wondering about the labor cost if installed at the dealer.

You are better off just getting the exhaust (which sounds great even on OPF cars) and then adding a flash tune like MHD.

The tune is very reliable up to about stage III. Stage 1 alone gives you 420 horsepower (a bit more with the TU fuel pump on your car) and you don't need to change anything on the car (though the torque converter might be a good idea).

[Chappers 71]

If you still have BMW warranty then yes the BMW Power & Sound kit, although fairly expensive would be your best bet if you want a little more power & the M Perf exhaust does sound very nice on a straight six.

Avoid after market tunes if you don’t wanna void your bmw warranty

[Warp Ten]

I did the M Performance exhaust only on my 2019 540xi (pre-LCI) with the B58 engine. Had my local dealer install it back in May of 2019 for a total of $2,216; $1,800 of that parts. The cost to do everything in the M Performance kit seemed too high for the end result; I really was just looking to improve sound so I just did the exhaust. I had them save my take off parts just in case I decided to go back to stock. Had it on for a year. It definitely made the car louder and overall I felt it sounded better. However, my wife complained that there was too much drone (there was some, surprising me that BMW couldn't get rid of it). So I ended up having the stock system returned to the car and I sold the take off M Performance exhaust locally to someone who appreciated it more than my wife for about half price. Good deal for him and I got some of my money back. I am still happy with my car in stock form and plan to keep it a long time.--Bob

[ahakanc90]

Originally Posted by Warp Ten

I did the M Performance exhaust only on my 2019 540xi (pre-LCI) with the B58 engine. Had my local dealer install it back in May of 2019 for a total of $2,216; $1,800 of that parts. The cost to do everything in the M Performance kit seemed too high for the end result; I really was just looking to improve sound so I just did the exhaust. I had them save my take off parts just in case I decided to go back to stock. Had it on for a year. It definitely made the car louder and overall I felt it sounded better. However, my wife complained that there was too much drone (there was some, surprising me that BMW couldn't get rid of it). So I ended up having the stock system returned to the car and I sold the take off M Performance exhaust locally to someone who appreciated it more than my wife for about half price. Good deal for him and I got some of my money back. I am still happy with my car in stock form and plan to keep it a long time.--Bob

Great perspective thanks. Do you remember what it would have cost to install the entire kit?
Also what does too much drone mean?

[NGT2]

Originally Posted by ahakanc90

Great perspective thanks. Do you remember what it would have cost to install the entire kit?
Also what does too much drone mean?

Drone means you can hear the exhaust in the cabin, even at normal driving speed/rpm.

[Warp Ten]

Originally Posted by ahakanc90

Great perspective thanks. Do you remember what it would have cost to install the entire kit?
Also what does too much drone mean?

Sorry but I do not recall the cost of installing the entire Power and Performance kit but it did involved replacing the transmission torque converter so I am sure it would be more expensive than what I did.

As to drone, NGT2 is correct that there is more sound intrusion into the cabin, but what drone really means is resonance, which occurs at certain rpm points under light throttle on most engines. Essentially a spike in the sound at these frequencies; usually annoying. It is usually tamed with the use of Helmholtz resonators in the exhaust system. A Helmholtz resonator is like a closed coffee can with one pipe into it that allows sound waves to enter but no exhaust gas flow through. The resonators are specifically sized so that sound waves at certain (resonant) frequencies bounce around inside and cancel each other out. I am most familiar with resonance in 1990-1995 Corvette ZR-1 LT5 engines, which I researched fairly extensively many years ago with the help of an acoustics engineer. Without such resonators, the LT5 engines produce excessive resonance frequencies at 1,800 (120 Hz) and 3,200 rpms (230 HZ) under light throttle. The stock exhaust system and several aftermarket ones utilized two Helmholtz resonators, one in the center resonator and one (each) in the rear mufflers sized to cancel out these two specific frequencies. This has long been a solution, even with aftermarket systems that have straight through pipes, so that is why I was surprised BMW had not been able to fix it. Sorry for the long winded explanation, but that essentially describes drone. Below is a (very old) picture of a Corsa middle resonator that obviously has straight through pipes but the second picture is a close up that shows the entrance to the Helmholtz resonator near the front of the pipe. The resonator surrounds the pipe and is specifically sized to eliminate drone at one of those resonance points (I forget which). --Bob

[ahakanc90]

Following up on the subject. I have been looking into bootmod3 and reading that it requires something called bench DME unlock or something like that. But I also saw that this became exponentially harder for vehicles newer than MY2020/21. Basically you would have to ship your ECU to Europe and it costs thousands. Anyone have info on this?

Edit: Looks like JB4 is the way to go:
https://burgertuning.com/collections...48-b58-bmw-jb4

[ahakanc90]

Originally Posted by Neusser

You are better off just getting the exhaust (which sounds great even on OPF cars) and then adding a flash tune like MHD.

The tune is very reliable up to about stage III. Stage 1 alone gives you 420 horsepower (a bit more with the TU fuel pump on your car) and you don't need to change anything on the car (though the torque converter might be a good idea).

Looks like MHD or BM3 is not practical for my 2021 540 since I would have to ship my DME for unlocking.

[Chappers 71]

I believe that with a JB4 the dealer will know it’s been running more than stock power & may effect any possible engine/drivetrain warranty claims, even if the JB4 is removed before taking it into the dealer.

[ahakanc90]

Originally Posted by Chappers 71

I believe that with a JB4 the dealer will know it’s been running more than stock power & may effect any possible engine/drivetrain warranty claims, even if the JB4 is removed before taking it into the dealer.

Yeah my warranty runs out on 6/30/2025. I will probably get MPPSK until then and try JB4 after.

[The Zimmer]

I have this on my Pre LCI 540i and absolutely love it puts a smile on my face.

Correct me if I am wrong but I thought MPPSK was only for pre Lci as it bumps power from 340hp to 375hp

The LCI B58TU already out puts that power so I thought only MPE available for LCI

[Neusser]

Originally Posted by The Zimmer

I have this on my Pre LCI 540i and absolutely love it puts a smile on my face.

Correct me if I am wrong but I thought MPPSK was only for pre Lci as it bumps power from 340hp to 375hp

The LCI B58TU already out puts that power so I thought only MPE available for LCI

LCI cars actually have a bit less power than pre-LCI (333 vs. 340), despite the improved fuel pump found in the top stock versions of the B58.

MPPSK is problematic for cars with OPFs in some countries (regs)., but is usually all clear for any cars up to about 2019 (not sure of exact month). It also bumps power to 360 (over here at least). MHD is better value for money, as the B58 is criminally undertuned from the factory.

[ahakanc90]

Originally Posted by The Zimmer

I have this on my Pre LCI 540i and absolutely love it puts a smile on my face.

Correct me if I am wrong but I thought MPPSK was only for pre Lci as it bumps power from 340hp to 375hp

The LCI B58TU already out puts that power so I thought only MPE available for LCI

Confirmed with the dealer that MPPSK is only for pre-LCI and MPE is the only option for LCI models.

[ahakanc90]

Originally Posted by Neusser

LCI cars actually have a bit less power than pre-LCI (333 vs. 340), despite the improved fuel pump found in the top stock versions of the B58.

MPPSK is problematic for cars with OPFs in some countries (regs)., but is usually all clear for any cars up to about 2019 (not sure of exact month). It also bumps power to 360 (over here at least). MHD is better value for money, as the B58 is criminally undertuned from the factory.

MHD or BM3 is impractical for LCI since you would have to ship out your ECU to be unlocked. JB4 seems to be the only practical solution.

[Neusser]

Originally Posted by ahakanc90

MHD or BM3 is impractical for LCI since you would have to ship out your ECU to be unlocked. JB4 seems to be the only practical solution.

I don't think a JB4 is a bad option either. I considered getting a JB+ for a little bit of extra kick, since I could just pop it on and off in a few minutes before my TÜV inspections.

Have only heard and read good things about the units. They are a bit rare over here though.

[Joe-BMW33]

Originally Posted by ahakanc90

Great perspective thanks. Do you remember what it would have cost to install the entire kit?
Also what does too much drone mean?

Think about drone like a constant subwoofer rumble. It's more the vibration of the low frequencies that transfers to the car and the cabin. If you have drone, it is most evident when cruising down the highway at a constant speed and is annoying.

[Warp Ten]

Originally Posted by Joe-BMW33

Think about drone like a constant subwoofer rumble. It's more the vibration of the low frequencies that transfers to the car and the cabin. If you have drone, it is most evident when cruising down the highway at a constant speed and is annoying.

Joe is right. With the C4 ZR-1s, the 120 Hz resonance frequency induced at 1,800 was exactly at 70 mph typical cruising speed with the stock 3.49 rear axle, so every light throttle application produced a very unpleasant drone with most aftermarket exhaust systems of the era. Back then, only the OEM and Corsa systems eliminated the drone, and one could also change the rear axle ratio to a 4.10 to move the speed a bit where it occurred. --Bob