[swilliams97@gmail.com]

Is there a good aftermarket exhaust that would make the 840i sound more like the M850?

[Beemer5to3]

No exhaust in the world will make a straight 6 sound like a V8.

As far as I’m aware, nothing exists for the 840i - I’ve tried looking myself. Would have to be a custom job.

[r33_RGSport]

Originally Posted by swilliams97@gmail.com

Is there a good aftermarket exhaust that would make the 840i sound more like the M850?

I can get you Fi Exhaust, but it won't be able to growl the same as V8.

[TupperBMW]

^ There really needs to be a valveless exhaust for the 840i

I mean, the B58 is a nice sounding engine that doesn’t really need muffling the way a loud V8 would. I had the AWE valveless on my M340i and it sounded incredible. Sounded way better than my stock M850i currently does, which has a great V8 rumble but is just far too quiet.

[bloozemanAZ]

Originally Posted by TupperBMW

^ There really needs to be a valveless exhaust for the 840i

I mean, the B58 is a nice sounding engine that doesn’t really need muffling the way a loud V8 would. I had the AWE valveless on my M340i and it sounded incredible. Sounded way better than my stock M850i currently does, which has a great V8 rumble but is just far too quiet.

Check the thread history as a simple mod to negate the valves on the M850i. Just need to ensure (Sport Plus is a good option) to take a drive and once the car is off verify the valves/flaps are open and pull the fuse. No CEL, etc. and wide open from then on.

[Beemer5to3]

Originally Posted by r33_RGSport

I can get you Fi Exhaust, but it won't be able to growl the same as V8.

How much are these out of interest?

[r33_RGSport]

Originally Posted by Beemer5to3

How much are these out of interest?

I can’t speak for UK pricing.
It may be different than US.
You may need to contact local retailer on that.

[Sinister840]

Did you ever find an exhaust for your 840i? I find something on GT Haus and Armytrix.

[Accentu8]

My 840 exhaust flap opens as soon as it idles down at cold start. If warm start opens at start up. Plenty loud, rumbling and even pops. I heard a 840 GC with a straight pipe and was louder, but sounded like ricer. Lol, no thank you! I think BMW did a great job on the stock exhaust in the 840, but I’ve also heard that in UK it’s more muted. There’s a thread on this topic for UK 840.