[mbdelta]

How does your M850i sounds like?
Post a clip of your m850i exhaust sound and tell us witch mods did you made or if its stock.

[TupperBMW]

My kind of request! These first 2 videos are with my recently installed Fi exhaust (OEM downpipe):

For this video you will find the clips about 1 minute in:

For this video there are revs and a drive by further into the video:

This is with the OEM exhaust:

[NGT2]

Originally Posted by TupperBMW

My kind of request! These first 2 videos are with my recently installed Fi exhaust (OEM downpipe):

For this video you will find the clips about 1 minute in:

https://youtu.be/ns09J6s8140?si=mvfrtQoOo8E2X44C

For this video there are revs and a drive by further into the video:

https://youtu.be/J61r5iB_E5U?si=Pb2eAYUFVPO7ZYtV

This is with the OEM exhaust:

https://youtu.be/uYQ4G567De4?si=4DE6sddL6xcrh1QN

Prett car and sounds awesome. What color is that?

M850 stock sounds better than M550 stock. I’ve read there’s only one resonator but I’m sure it’s a different muffler also.

[mbdelta]

Originally Posted by TupperBMW

My kind of request! These first 2 videos are with my recently installed Fi exhaust (OEM downpipe):

For this video you will find the clips about 1 minute in:

For this video there are revs and a drive by further into the video:

This is with the OEM exhaust:

I’m already a subscriber of your YouTube channel since 3 months or so.
Love your videos. There should be more videos like yours.

[bloozemanAZ]

No doubt that an aftermarket exhaust or just some mods to the factory exhaust will achieve a better sound. That said I'm happy with just the simple mod of pulling the fuse that controls the valves when they are open. Even in comfort it has plenty of grunt aka burbles and gurgles.

But for my daily drive I use Sport Individual with the engine set to Sport Plus (key as richer fuel mixture via the ECU), transmission in Sport (Sport Plus is too aggressive for just daily driving) and the chassis/suspension on Comfort (key for the crappy streets in the area). Pure bliss as cold starts even in comfort (Sport Plus won't make them louder) are glorious. Switch to Sport Individual for the drive and as the saying goes "now we're cooking with gas".

[TupperBMW]

Originally Posted by NGT2

Prett car and sounds awesome. What color is that?

M850 stock sounds better than M550 stock. I’ve read there’s only one resonator but I’m sure it’s a different muffler also.

Off the top of my head I'm forgetting the actual name of the color (I didn't spec my car myself).

I really don't know if the M850i sounds different than the M550i. I've test driven the latter. Any reason that they should sound different?

[NGT2]

Originally Posted by TupperBMW

Off the top of my head I'm forgetting the actual name of the color (I didn't spec my car myself).

I really don't know if the M850i sounds different than the M550i. I've test driven the latter. Any reason that they should sound different?

The only reason I’ve ever read about is the M850 has one resonator plus the main muffler while the M550 has two resonators plus the main muffler. I actually removed both resonators and only have the muffler now. For $300 or so, it’s a good exhaust mod for the money and it sounds better. But not as good as if you actually go get a new system from Dinan, Remus, etc.

[Gr8 Ape]

I’ve owned both, and pulled the exhaust valve fuse on each. Both had decent sound stock—considerably better sans fuse—but the M850 sound is better in each instance. Couldn’t begin to tell you why.

[NGT2]

Originally Posted by Gr8 Ape

I’ve owned both, and pulled the exhaust valve fuse on each. Both had decent sound stock—considerably better sans fuse—but the M850 sound is better in each instance. Couldn’t begin to tell you why.

It could also be the way the computer is tuned. If the aftermarket guys can change burbles and pops and cold starts, then BMW can too. I think it’s be design regardless of how or why. The 8 is supposed to be flashy and sporty. The 5 is supposed to have that degree of subtlety.

[Gr8 Ape]

Under the category of “be careful what you wish for,” I’ve pulled the exhaust valve fuse and, in my sedate, otherwise quiet neighborhood, when I start my car it sounds like the beginning of a NASCAR race. Now I either have to (1) start my car with the garage door closed (not sure my marriage is sufficiently stable to survive that), or (2) replace the fuse and just drive in Sport/Sport+ after start-up. Although the latter is eminently acceptable, I seem to recall that the M850’s may be programmed to start up with both valves open initially. Should that be the case, replacing the fuse will not solve my Talladega mornings dilemma. Any advice (aside from trading for a Prius) would be appreciated.

[NGT2]

Originally Posted by Gr8 Ape

Under the category of “be careful what you wish for,” I’ve pulled the exhaust valve fuse and, in my sedate, otherwise quiet neighborhood, when I start my car it sounds like the beginning of a NASCAR race. Now I either have to (1) start my car with the garage door closed (not sure my marriage is sufficiently stable to survive that), or (2) replace the fuse and just drive in Sport/Sport+ after start-up. Although the latter is eminently acceptable, I seem to recall that the M850’s may be programmed to start up with both valves open initially. Should that be the case, replacing the fuse will not solve my Talladega mornings dilemma. Any advice (aside from trading for a Prius) would be appreciated.

If it’s like the 550, you’re right. It starts up with both valves open. These cars have loud cold starts. But it only lasts 30-60 seconds. It’s like a crying baby - it’s louder for you than anyone else because you’re self conscious about. The neighbors will get used to it.

[TupperBMW]

LOL, you guys really must not have heard a truly loud cold start before.

The cold start with my M850i with Fi Exhaust valve open is definitely increased in volume (as it SHOULD be!), but not really all that noteworthy. Certainly not worthy of being labeled NASCAR