Hey y’all, I’m thinking of going for a VRSF catless 4 1/2 inch down pipe for my 21 x3. But my question is, what’s the best/most reputable downpipe for these cars, and what sounds the best a 6,5 or a 4.5 inch? And how bad is the catless smell?
(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
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?
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?
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.
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.
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.
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:
Any help identifying the correct part number would be appreciated.
UPDATE: ran a data log barley know how to read it 😂 attached below any info is appreciated
Got a x4 m40i Stage 2 MHD 93 OCT
Vrsf Catless Downpipe
Ive been averaging in the last 6 pulls 4.04-4.1 0-60
I was expecting more in the 3.8’s
Am i missing something here?
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
inside of my factory turbo inlet at 104k miles, car is state 2 bm3
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.
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
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!
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
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?
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 ?
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