r/B58Enthusiasts

Really been looking to getting a 2017-2019 540i, planning to tune it and drive spiritedly a handful of times. I’ve yet to find an answer from people with experience and I don’t really have the time right now to go out and test drive some of these, but I am concerned about the suspension. I’m into sporty but also comfort, however I don’t want to stage 2 this car and have the performance be held back by floaty and soft suspension. Is the base suspension that bad when pushing bigger power? I know that it will feel nothing like a 3 or 4 series, but I just don’t want to be severely limited by how the car drives and feels under load. I understand it should be hard to find one with the m sport suspension, let alone the m adaptive suspension. If I end up making my mind that the ride feel will be a limiting factor for me I might look into the x3m40i gen1 instead for a couple extra thousand bucks. Is that a good alternative if I can’t find a 540 with the m sport/adaptive suspension?

Hey there! I've got an m440i xdrive convertible (gen 2, b58).

Current mods

• AA downpipe
• Dinan intake
• MHD ECA
• S58 injectors
• EDIT: xHp trans flash

Goals

• 10.5 quarter mile
• Keep stock trans
• Keep stock cat-back exhaust

I'm pretty sure that any of the hybrids will get me close to where I want to be. With E40 in the tank, the car ran back-to-back 11.48's at the track on the OTS stage 2 map. The car had a full tank of gas; DA wasn't amazing. I could reliably chase after an 11.3X pass, but I'd rather skip that and go after my 10.5 goal. There are 2 local used turbos available: a 6769 and an Omega 65, both in the $2X00 range. While the price looks good on the used turbos, does that leave me with a severe lack of post-purchase support from the manufacturer if I need it? I'm 95% sure I'll need the DS25 HPFP as well to reach this goal with whatever I pick, so that's in the budget. The injectors were picked up because FCP Euro had them on the cheap.

What do you all think? I think that any of the DAW or Pure offerings that are complete units will handle it, but there has to be some pros/cons between them. It's mainly a weekend cruiser, but I think a solid mid-10-second car on a 'mostly' stock exhaust will be a fun surprise when I want to get on it and fly under the radar from unwanted attention.

Just got a 2026 Tanzanite Blue m340i xdrive fully loaded. I bought the full 7 year extended warranty including maintenance etc. I really want the car to be louder. I don’t want to push it so far in rpms for it to actually make noise. I’m just scared of the warranty being voided or getting some issue with the car.

I’ve seen so many things online like AA catted downpipe or 200 Cell Downpipe and a catback exhaust and that anything that doesnt go further than touching the cats (like a catless) won’t void the warranty.

Can I have some experts in here help me on what the best thing to do is. Right now im thinking exhaust but I also don’t know which is the best bang for my buck. Thinking alibaba valvetronic because of budget and how promising it is, but I really don’t know. Its hard to tell on videos. I also drive to uni and live in a quiet neighborhood so I want the option (like a valve remote) to make it quieter and close valves if needed.

I was scrolling through the settings on my 2020 X3 M40i (iDrive 7) and noticed the “Engine Sound” option.

It’s currently on “Depending on driving mode.” Curious what actually changes mechanically if I set it to “Sporty” full time. Is it purely ASD through the speakers, or does it also affect the exhaust valve behavior?

Anyone know for sure?

Looking at 2017-2019 b58s and wondering what experiences yall have had around 80-90k mileage range. Like engine bay components and suspension components

I recently did a muffler and resonator delete but it will only pop and bang/burble on a cold start, it is only louder when driving and revving later on after a cold start. I want it to pop and bang/burble while driving and just in general revving after a cold start. Why does it do this? I thought maybe the deletes weren’t enough and I possibly have to get a down-pipe + tune. Is it just my car? 😅

I have a new RS3 with around 2,000 miles wondering if an intake would cause me warranty issues if something ever happened. Just wondering

Bought it with 8 miles on the clock and now I’m past 115k miles. Now I smell coolant when I exit the car after driving. I’ve gotten the top-off coolant notification a few times now and luckily always kept the OEM coolant lying around just for stuff like this. I recently changed the Coolant cap as I don’t think I ever have and I think bmw recommends changing it every 30k but I don’t think it’s fixed the problem. I don’t see white residue anywhere and I don’t have puddles of coolant under the car so currently have no idea where the leak is coming from. Any suggestions? I’m can do my own work with the help of my dad if I need it just need to be pointed in the right direction.