[medphysdave]

I've gotta say that the AA EL midpipe with stock exhaust sounds great on the F80 cars. I really don't want to cut my exhaust, but for the price, this would bring a lot of satisfaction.

Keep us posted on the install.

[Alpine*]

Yeh, I’m thinking the same.

[CSBM5]

Originally Posted by sdhotwn

With the different tips for the CS being welded on from the factory that alone could be a source of a different part number even without internal changes. I'm curious if the resonator and other part numbers match up too.

Yeah if it was otherwise identical that would definitely result in a different part number...good point! I did check the cat part number, and it is different than the M2C (assuming I checked the right part!)...the front most cat.

[GoneIn4Secs]

Other than the exhaust, what improvement do you see in underbody over the n55 m2?

[Mospeada]

theres nothing special about this underbody vs m2c. m2cs = some CF bits and pieces here and there, with M4C engine tune

whereas m3/m4 cs = magnesium oil pan with extra 0.5L oil capacity, cf drive shaft, different engine and DCT tune, and exceptional cooling, etc.

[sdhotwn]

Originally Posted by Mospeada

theres nothing special about this underbody vs m2c. m2cs = some CF bits and pieces here and there, with M4C engine tune

whereas m3/m4 cs = magnesium oil pan with extra 0.5L oil capacity, cf drive shaft, different engine and DCT tune, and exceptional cooling, etc.

I believe this is a mixture of accuracy.

As far as the CS versus M2C - so far there do not appear to be any underbody differences. Back to the N55 M2, those differences have been debated between M2C and N55 M2 in other areas so I won't cover that.

There are several sources that have said there is more cooling on the CS than the M2C, but nobody has seen parts or anything to confirm that.

As far as this comment on the M3/M4 CS. yes on the Magnesium pan an capacity, the CF driveshaft was pulled over from the early days of the M3/M4 F80's, so that was not really "new". The M2 CS has a different engine and diff tune as well, and the supposed additional cooling. Not sure what the "etc" is. The M2 CS is carrying the integral carbon roof that wasn't even on the M3/M4 CS, plus adaptive dampers from the M3/M4's that was not on any M2.

Each bit is what it is, and the cars are what they are. The CS models are all slight iterations, and have done well for improving over their stablemates.

[GoneIn4Secs]

I thought they stopped making the CF driveshafts a few years ago due to them breaking?

[sdhotwn]

Originally Posted by GoneIn4Secs

I thought they stopped making the CF driveshafts a few years ago due to them breaking?

That's my understanding (stopped making/using them). I also hadn't heard they were on the M3/M4 CS, but I'm assuming he is correct with what he put forward. Not worth challenging things I'm not confident around.

[pz619]

Originally Posted by GoneIn4Secs

I thought they stopped making the CF driveshafts a few years ago due to them breaking?

I believe it was because the larger OPF on Euro cars meant they had to go to a steel driveshaft as those are smaller in diameter versus the CF driveshaft.

[Poochie]

Originally Posted by sdhotwn

That's my understanding (stopped making/using them). I also hadn't heard they were on the M3/M4 CS, but I'm assuming he is correct with what he put forward. Not worth challenging things I'm not confident around.

WoW, this is a rarity for the internet; someone actually humbling themself and admitting they don't have all the answers, instead of just merely pulling it out off their ___ and stating such as fact.

BTW, the F8X CS does retain the carbon fiber driveshaft, BMW stays they eliminated on newer standard M4s due to "emissions" (pause for &#128580, yet kept it on the same model year GTS and future year CS.

https://www.bimmerpost.com/forums/sh...php?p=24987504

[ScullyD]

Originally Posted by sdhotwn

I'm curious if the part number on the muffler can matches or not. Baffling could be different inside. 1-830-8-747-994

I'm thinking of calling a parts department before i change to see what the part numbers are on all parts of the exhaust system. If its unique to the CS, i'm tempted to leave it, as i'd be buying more and more into the hype that there are horsepower gains from the exhaust. If its not, i'll replace with an Akrapovic. Or if someone does a dyno before and after the akrapovic slip-on only.

Anyone who says the M2 CS stock exhaust sounds good, i'm sorry, you need to get your ears checked. Its awful, both in OPF and non-OPF.

[M2C_PLUS]

Originally Posted by GimmeanM

I've thought about the EL mid pipe for awhile now. While I have not spent any time in my car yet to judge for myself I'm just going off of that S55 dueling 3 cylinder sound that I just don't enjoy.

Not to derail, but I have an HMS full exhaust (mid pipe and rear) on my 1M and it sounds in-freaking-credible!! Absolutely love it. If I do replace the rear on the CS it'll have to be stainless, I'm not a fan of the tinny sound that titanium gives.

That does sound good, I have a 1M also. Any links to that exhaust? Running Decats too?

[MFNATIK]

Is the rear subframe of the M2 bolted directly to the chassis like the F80? Just curious how similar the F gen cars are for this engineering element.

[Poochie]

Originally Posted by ScullyD

I'm thinking of calling a parts department before i change to see what the part numbers are on all parts of the exhaust system. If its unique to the CS, i'm tempted to leave it, as i'd be buying more and more into the hype that there are horsepower gains from the exhaust. If its not, i'll replace with an Akrapovic. Or if someone does a dyno before and after the akrapovic slip-on only.

Anyone who says the M2 CS stock exhaust sounds good, i'm sorry, you need to get your ears checked. Its awful, both in OPF and non-OPF.

From what I understand, you really don't gain any kind of power, in any form, from a cat-back exhaust, unless original piping had a "scavenging" lost, due to a poor design flow, to begin with.

And from what I see, it's the same exact exhaust as the "C" - minus the tips and maybe less sound deadening..

I would be skeptical if anyone claims any power gains going from a fully-functioning stock exhaust, to aftermarket, regardless of the model.

I don't really care what my BMW sounds like, just give me any aural feedback, without the pops & burbles - I just loath the attention those sounds attracts and they are antithetical to the sophistication BMWs are suppose to commandeer..

[clutchdj]

Originally Posted by MFNATIK

Is the rear subframe of the M2 bolted directly to the chassis like the F80? Just curious how similar the F gen cars are for this engineering element.

Yes.

[ScullyD]

Originally Posted by Poochie

From what I understand, you really don't gain any kind of power, in any form, from a cat-back exhaust, unless original piping had a "scavenging" lost, due to a poor design flow, to begin with.

And from what I see, it's the same exact exhaust as the "C" - minus the tips and maybe less sound deadening..

I would be skeptical if anyone claims any power gains going from a fully-functioning stock exhaust, to aftermarket, regardless of the model.

I don't really care what my BMW sounds like, just give me any aural feedback, without the pops & burbles - I just loath the attention those sounds attracts and they are antithetical to the sophistication BMWs are suppose to commandeer..

Chris Harris (and i'm admittedly acknowledging he probably had no idea what he was saying) said the following in Top Gear Mag that make me skeptical about changing the exhaust:

[zamboni]

Originally Posted by CTSean

Definitely standard M2. This guy uploaded an "undercarriage walkaround" a bunch of years ago and you can see the same machined aluminum part at 2:33

Thanks for sharing nice garage.

[Davil]

Originally Posted by Poochie

I would be skeptical if anyone claims any power gains going from a fully-functioning stock exhaust, to aftermarket, regardless of the model.

I don't really care what my BMW sounds like, just give me any aural feedback, without the pops & burbles - I just loath the attention those sounds attracts and they are antithetical to the sophistication BMWs are suppose to commandeer..

Yes aftermarket exhausts are a bit like using clothes pegs and football cards on your bicycle spokes to get a cool sound. I liked doing this when I was 10.

Apparently less obnoxious firecracker noises on the CS. I'm looking forward to this if true. I'll know soon and report back.

[city1991]

Originally Posted by sdhotwn

I assume nothing new to see here, but I figured I'd share the photos I took after I rinsed off the salt on the lift.

I did not have an M2 before, so I was really impressed at all the bracing and attention to detail for rigidity that is in place on these things!

Beautiful car!

[Poochie]

Originally Posted by Davil

Apparently less obnoxious firecracker noises on the CS. I'm looking forward to this if true. I'll know soon and report back.

From the couple of reviews I saw so far, the CS does not have that obnoxiously loud pop and burbles, of which BMW had seem to turn up the volume to 11 on, within the last couple of years. Seems that the CS has even less of that cacophony, even more so than the current Competition model.

I assume this because of the new Euro noise ordinance, for the newer model years, that has trickled down to all current vehicles. However, I believe, Australia, where you reside, vehicles doesn't come with an OPF. So you'll get the unbridled exhaust..

I welcome the scale back on overrun bubbles fad but I get why some that crave attention might be disappointed by this but honestly, it wasn't doing you any favors; trust me, the average person observing your car drive by is not charmed by you new Bimmer sounding like a old misfiring carburetor engine.

Anyways, you lucky dog - I'm looking forward to your CS review..

[RJC-1]

Originally Posted by sdhotwn

I assume nothing new to see here, but I figured I'd share the photos I took after I rinsed off the salt on the lift.

I did not have an M2 before, so I was really impressed at all the bracing and attention to detail for rigidity that is in place on these things!

Nice M2.
What were you cleaning the car with? Any issues with the dirt residue on the garage floor, or do you hose/squeegee it out?

[Hedoniste]

Originally Posted by Poochie

From the couple of reviews I saw so far, the CS does not have that obnoxiously loud pop and burbles, of which BMW had seem to turn up the volume to 11 on, within the last couple of years. Seems that the CS has even less of that cacophony, even more so than the current Competition model.

I assume this because of the new Euro noise ordinance, for the newer model years, that has trickled down to all current vehicles. However, I believe, Australia, where you reside, vehicles doesn't come with an OPF. So you'll get the unbridled exhaust..

I welcome the scale back on overrun bubbles fad but I get why some that crave attention might be disappointed by this but honestly, it wasn't doing you any favors; trust me, the average person observing your car drive by is not charmed by you new Bimmer sounding like a old misfiring carburetor engine.

Anyways, you lucky dog - I'm looking forward to your CS review..

Mine has zero pop and burbles.