Honestly, I'm super cautious about this because I've seen too many MAF sensors get ruined! If you wanna stay safe, definitely go with a dry filter like the AFE Power Magnum FLOW Pro DRY S Air Filter or the BMC FB01089 High Performance Air Filter in the dry version if you can find it. Oiled ones are amazing for flow but basically a nightmare if you over-oil them once! I'd highkey play it safe and stick to dry synthetic for your daily driver... seriously, it's not worth the risk haha.

Ok so, I've been down this road with my N55 and honestly... I regret going the oiled route. In my experience, the tiny bit of extra flow you get from an oiled filter just isn't worth the headache. I had issues with my MAF sensor getting gunked up with oil residue after just 5k miles, which triggered a frustrating limp mode. Not fun.

For your situation, I HIGHLY recommend sticking to a high-quality dry filter. It's way safer for your sensors and honestly, you won't feel a massive difference between oiled and dry on a daily driver anyway. Here's what I suggest:

* aFe Power Magnum FLOW Pro DRY S Air Filter - This is what I run now. Better flow than stock but totally dry.
* K&N Select Replacement Air Filter - If you MUST go oiled, this is the standard, but seriously, be careful with the recharge kit.

Basically, dont overthink the 'performance' boost. It's mostly about a slightly better induction noise and knowing you aren't choking the engine with cheap paper. Stick to dry and save yourself the potential sensor cleaning bill. gl!

Sooo I went through this last year with my B58 and totally get where you're coming from. I spent way too much time obsessing over the oiled vs dry debate lol. Honestly, I started with an oiled filter because I wanted that old-school performance vibe, but I noticed the same thing the first guy mentioned—eventually, you just worry about the MAF too much.

I swapped over to a dry setup and basically felt no difference in power, but the peace of mind was worth it. For your budget, here's what I've seen work well:

* aFe Power Magnum FLOW Pro DRY S Air Filter - This is usually around $85 and super easy to maintain since you just wash it with soap and water.
* Apex Pro Dry S High Flow Replacement Air Filter - Another solid dry option that fits the stock housing perfectly for about $90.
* BMC FB010/20 High Performance Air Filter - If you really want that "Formula 1" heritage and dont mind the oil, this is the top-tier choice for flow, usually around $110.

But yeah, for a daily, I definitely prefer the dry synthetic route now. It's just less messy and basically bulletproof for the long run. gl with the build!!

Ok so, for your budget and the BMW platform, I'd honestly steer clear of the oiled stuff. If you're looking for the best bang-for-your-buck without risking your MAF sensor, I'd go with the AFE Power Magnum FLOW Pro DRY S Air Filter. It’s right around $85-$100, so it fits your budget perfectly while leaving room for other small mods.

Here’s why I suggest going dry:
1. It’s basically a buy-it-once deal; you just vacuum it or use a gentle soap to clean it, no expensive re-oiling kits needed.
2. The filtration efficiency is top-tier for a daily, so you aren't sacrificing engine longevity for a tiny bit of flow.
3. You get a *noticeable* change in intake sound—nothing crazy, but you'll hear those turbo spool sounds a bit better.

I mean, for a daily driver that hits the backroads, the risk of oil residue just isn't worth it when modern dry synthetics flow this well anyway. Plus, it's literally a 5-minute install. GL! 👍

Just caught the end of this discussion and wanted to chime in from a DIY perspective. Tbh, while everyone is right about the oiled vs dry debate, a big thing people overlook when doing this themselves is the actual airbox hygiene. I remember the first time I swapped a filter on my N55, I was so hyped for the "performance" boost that I didn't realize I'd pinched the airbox seal when closing it back up. It ended up throwing a weird code because of a minor vacuum leak. If you're gonna do the swap yourself, ngl, the most important step is thoroughly vacuuming out the bottom of the intake housing before the new filter goes in. I've seen guys drop a high-end filter right on top of old leaves and road grit, which basically defeats the purpose of better airflow. Also, a huge warning for when you eventually clean it: don't use high-pressure compressed air. I made that mistake once and I'm pretty sure I blew tiny holes right through the filtration media. Just tap it out gently or use a dedicated vacuum. It’s a super easy 10-minute job, but doing it sloppy can cause more headaches than it's worth.