@thendrix Time to replace the air filters in the vehicles or wash the K&N along with getting the oil off all the sensors after it. I don't regret getting a K&N because I have to deal with a lot of dust. There is just the issue of washing it, letting it air dry, oiling it and letting it soak up the oil. That's like 4 hours.

The drop in replacements make the engine sound better. I can't say that it makes more power but it seems to. The Interior air filter is always a good one to replace as some of the sensors are susceptible to getting coated and failing. Those might require pulling the entire front interior of a vehicle to replace. The First Gen Fusions, Mercury something and Lincoln MKZ are bad about it. I've had to replace that 30 buck sensor on two occasions. There's no air filter on those and the AC refuses to work if it fails.

30 dollar part with around 500 in labor. Yep tree cum time means time to replace all the air filters. Pine pollen is too large to cause allergies but the perfect size to clog an air filter. The South without AC isn't fun unless it's an old pickup or car with the air vents near the window.