Go with Wix if you care about air filtration. I haven't heard of any brand that beats Wix in that regard, for both intake or cabin filters.
Pros: superior air filtration
Owner reviews for air filter
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Mahle is decent i believe they are OEM supplier for BMW and alot Europe vehicle as compared to Acdelco for GM and domestic vehicles not talking filters just in general there.
I'd just go with the K&N as you seem to want the best bargain for the $. These K&N filters are very good and will be the last time you buy a air filter. Simply next time you need to replace what I do is spay clean through both side with a garden hose. Air dry, spray a lil oil on it "k&n" re-oil. The oil is what collects the dust. And reinstall back in the car. Plus there proven to add 1 or 2 HP.
I actually use one in my 21 Civic type R, recently cleaned and reinstalled for the 3rd time.
Pros: long lasting, good value
Vehicle:
Honda Civic
Been using a K&N on my car since 1996 or 1997 when my car had around 90k miles. Car currently has 505k miles. I clean it once a year. It flows like a new paper filter even after 20k miles. I still use a paper filter whenever I have to wait for the K&N filter to air dry after cleaning it.
Pros: long lasting, good flow
Mileage: 505000 km
Get an K&N or HKS air filter and never buy another filter again. They usually come with a cleaning kit which is used once a year. One of the better investments I’ve made for my car.
Pros: long lasting, good investment
K&N high flow lifetime filter. Higher airflow (you'll hear turbo spool and gain a few HP), and you never need to change it - you can wash it after 50-70,000 mi, or whenever you feel it's dirty enough to clean, but you've never got to buy another filter again...
Pros: Higher airflow, lifetime filter
Mileage: 70000 km
Buy an aftermarket dry filter (Mann, Filtron etc.) and install that.
I have the K&N air filter in my Badlands. Difference is very minor.
Pros: minor difference
The list is mostly fine (the fuel treatment isn't needed). It's way too expensive. Should be under $100 for the oil, filter, and rotate; should be under $300 for the brake fluid. The air filters you can do yourself for $50 and 10 minutes.
Cons: way too expensive
Vehicle:
Subaru Outback
I will never again waste money on a stupid K&N.
Cons: waste money, poor value
K&N filters aren't really worth it as the increased air flow isn't going to result in any significant gains since air/fuel ratio is computer controlled anyway. Not to mention you would really need better exhaust and a tune to take full advantage of increased air flow. Also, if improperly oiled, they can cause MAF sensor issues.
Cons: not worth it, no significant gains, can cause MAF issues
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