r/B58Enthusiasts

Image 1 — Alibaba exhaust FS
Image 2 — Alibaba exhaust FS
Image 3 — Alibaba exhaust FS
Image 4 — Alibaba exhaust FS
Image 5 — Alibaba exhaust FS
Image 6 — Alibaba exhaust FS
Image 7 — Alibaba exhaust FS
Image 8 — Alibaba exhaust FS
Image 9 — Alibaba exhaust FS

Alibaba exhaust FS

(CSZ)
Resonated, black gloss tips.
$550+ shipping
Shipping expected to be between 185-200 per UPS
call it $750. Get a quote from Alibaba and compare prices, you’ll save $250 and 1-1.5 months waiting.
Only 3 months old. Back to stock for me as I prep to sell my car soon

u/Thisisaburner01 — 12 hours ago
▲ 4 r/B58Enthusiasts+1 crossposts

540i alibaba exhaust

I currently have a 2017 g30 540i with a downpipe and mhd tune. The exhaust itself is stock and I was considering getting a valved alibaba exhaust thats pretty much a straight pipe with true dual exits (with quad tips). Would this make a huge difference and if you have done the same thing could you message me your before and afters?

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u/Trucys — 1 day ago

M240i catless downpipe sound clip

Couldn’t find any clips on m240i with just a DP and no tune so here it is for anyone else looking.

Just installed a catless downpipe and my exhaust has some white smoke coming out (very light) is this normal?

u/toolazy2thinkbro — 1 day ago

X3 M40i burbles/pops changed overnight after ONE loud pop — anyone seen this?

2019 X3 M40i (B58)
Need some opinions from people who actually know these cars.
Car used to have pretty strong burbles and crackles in Sport Plus — the typical B58 “fun” exhaust behavior, especially on lift-off in lower gears.
Then something weird happened:
While driving a few days ago, I got ONE unusually loud pop from the exhaust. Immediately after that, the character of the exhaust changed noticeably.
Now it feels like:
Burble intensity dropped a lot
Higher gears barely do any crackles anymore
The whole exhaust feels “muted” compared to how it used to be
Still gets occasional pops, but way less consistent
No CEL or warnings
Car drives totally normal otherwise, startup sound seems unchanged.
What’s confusing me is the timing — it literally changed right after that one loud pop, not gradually.
So I’m trying to understand:
Is this normal BMW/B58 behavior or ECU adaptation thing?
Could an exhaust flap/valve be partially stuck?
Or am I just overthinking normal variability?
Would appreciate input from anyone who’s seen this before on the M40i/B58 cars.

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u/SnooDoughnuts4268 — 2 days ago
▲ 6 r/B58Enthusiasts+1 crossposts

Squeak/chirp on weight transfer

I have a 2016 bmw 340 and have been experiencing this issue and can’t pin point it, was hoping someone could help. Only happens after putting the car in sports plus, it most noticeable during weight transfers or lower speed downshifts, also leaving from a dead stop u can hear it very noticeable, I’m not sure if this is a b58 or f30 problem so I’ll post in both . I attached a few videos where u can hear it clear as day. Any help would be appreciated. Thank you.

u/Extreme_Jackfruit775 — 2 days ago

540i xdrive ac not working

i just did the belt, waterpump, and both radiators on my 540i b58. and now the ac won't work. check the freon level and it's good. the compressor kicks on but then kicks back out after 3-5 seconds. has anyone else had this issue? if so what was the fix.

u/TKAM84 — 3 days ago

Drivetrain malfunction

My 2021 540i x drive at 40mph i tapped the gas a bit it jerked and kinda breaked then jerks again then it said drivetrain malfunction. I stopped the car and turned it back on it drove perfectly fine after that no warnings or codes or anything anyone know what this could be thanks.

u/Few_Acanthisitta_234 — 3 days ago
▲ 2 r/B58Enthusiasts+1 crossposts

B48 spark plug well cone/plastic piece found – what is it and part number?

Hi, I have a BMW B48 engine. When I removed the ignition coil, a transparent/yellow cone-shaped plastic/rubber piece came out with the coil, and it normally sits between the ignition coil and the spark plug in the spark plug well.

In my case it also looks damaged/torn, and I need to replace it but I cannot find the correct part name or part number. I’m not sure if it belongs to the ignition coil or the spark plug tube seal/valve cover system.

Is this:

  • a coil boot/part of the ignition coil assembly?
  • a spark plug tube seal / valve cover insert?
  • or something else specific to the B48 design?

Any help identifying the correct part number would be appreciated.

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u/Glittering-Mix-8295 — 3 days ago
▲ 6 r/B58Enthusiasts+1 crossposts

First coolant leak ,will this hose require taking off the intake manifold ?

The car is a 2019 540i, The hose under my main coolant reservoir started to have a small leak, the part number is BMW 17128602642, I think it connects to the heat management module and transcooler, will I have to take off the intake manifold to replace this hose ?

u/Relative_Cupcake_674 — 4 days ago

Blinker fluid is fine I checked

Getting ready to replace my purge valve solenoid. Anything else I should replace or take a look at while I’m under the hood? 2019 440i GC

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u/Camcolexx — 3 days ago

Thumping Popcorn Sound

Someone knows what this sound is coming from? Deep thumping popcorn sound like, (not the injectors high pitch sounds)

Car shakes when idling at 950+- rpms aswell after a start. No fault codes.

u/Due_Willingness4314 — 5 days ago

WTS Alibaba exhaust for 540

Mods: idk if allowed I messaged and didn’t hear back
I have a 3 month old Alibaba exhaust on my 540i. Going back to stock. If anyone’s in the market for one. I will ship; save you a few hundred off retail. It’s on my car will be off this weekend. Pic for reference, resonated version with black tips

u/Thisisaburner01 — 6 days ago
▲ 20 r/B58Enthusiasts+2 crossposts

Reputable Exhaust Shops

Hey guys.

I have an F33 2017 BMW 440i (convertible) with an exhaust I just recently ordered and I was just wondering if there was anyone here that can recommend me a reputable exhaust shop that wouldn’t overcharge for the install.

I personally live in Aventura area but commute to downtown daily so anywhere near either area would be preferred!

Thank you!

u/clummzii — 7 days ago

Engine Oil

Hi Guys,

What engine oil should I be running in my F36 440i?

Mileage is around 85k if that matters.

I've seen a plethora of answers online, and some people say you should switch up the oil you use as the mileage gets higher

TIA

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u/ohyeahmatey — 9 days ago

Knocking or tapping noise?

I’ve been trying to pinpoint what this noise is for a few months to no avail. (No I’m not talking about the noisy direct injection or noisy lifters) I’m talking about that tapping / knocking sound. I cannot be the only B58 owner that hears this lol. 40k miles, oil changed every 4-5k since new in case people ask. I’ve brought it in to BMW a few weeks back and of course it wasn’t making the noise during the inspection. Anybody else experience this, found what the issue was?

u/Plane-Oven-5934 — 11 days ago
▲ 4 r/B58Enthusiasts+1 crossposts

Best Oil for Gen1 B58?

Car is stage 2 mhd & stage 3 xhp ive heard mixed reviews about 5w-40 liquid moly. I live in Arizona!!!! so hot weather a lot what would you guys recommend? Im looking at 5w-40 or 5w-30 & brand preference? liquid moly vs motul ?

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u/Adventurous-Mix3035 — 11 days ago

Walnut blasting b58 before and after

Don't know how necessary it was but I'm pretty proud of myself I most say so.
If you guys wanna do it too, just be sure to spray some air into some PCV drilled holes you'll find either at the top right or top left of the intake port, some media gets blown past there, shouldn't be anything worrisome even then

u/Calamitas1819 — 11 days ago