I went with a K&N and wash it every oil change.
After I swapped to a K&N drop-in filter and a lighter cat-back exhaust (the one I had was lighter than the stock), I was getting around 22-24 MPG with my EcoBoost.
I change mine every year. Along with spark plugs and clean my filter’s (have k&N ones you don’t throw those ones)
Ive been using the k&n reusable filters, they have held up pretty well. Expensive.
I just put in the K&N drop in air filter and I notice surprisingly large throttle response. It almost makes the ascent feel like a lighter vehicle.
Fitted k&n drop in last night, mk7GTI, 100% feel a difference, very subtle but it’s there. I suppose time will tell if there’s a downside. Ever so slight difference in response, coasts slightly further in gear without foot on gas. Drove it a lot today and felt the fuel economy might be a tiny bit better too, but I’ve no solid proof whatsoever, but I drive it a lot so I know it very well. All of which would make sense from a less restrictive filter.
I put a K&N air filter in my 2010. My first cleaning was a few weeks ago before I went to Disneyland; I've had the filter installed about 9 months or so. It's performed well enough.
Many years ago I bought a K&N air filter for my Honda. I thought it made a SLIGHT improvement in performance but also made a significant difference in engine noise.
Yup, I already ordered a sinister diesel intake, the K&N really didn’t perform well on the truck, goin for more flow
In my experience they are a waste of money with risk of fouling MAF sensor. I’ve tried them in my diesels and gassers. I never once wasted my time cleaning and re-oiling a K&N. I just threw it out and went back to OEM.
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