I have found this online site the very best in navigation, product & shipping cost. I have both standard & offset flanged Brute Force Dryflow Air Filters. Maintenance wise have not led to extra expenditures to clean & upkeep these filters. The standard filters have served me well on various Toyota 4 & V6 engines where I have dispensed with the stock airbox & panel air filters. The OS is used on my daughters 2014 KIA Optima LX, 2.4l which has an aftermarket cai locating the Dryflow Air Filter close to the backside of the drivers side fog light. This may be an unusual fitment since the car is South Korean built or the car model & optional fog light housing. This one has the single outside lens.
I have been using the AEM Universal Tapered Cone Grey Media Filters for over 10 years, long before it was designated BF. My inventory consists mostly of the AEM 21-203BF Air Filters both standard and offset flanged. These serve me well on Toyota 4/6 cylinder and KIA 2.4l engines. After cleaning and maintenance on the filters, they are shelved and used on a rotational basis. The filters don't have the wire screen on the outside which other filters have, that in my opinion, is a bother. Especially if the screen breaks and damages the media or unseen and poke one's fingers/hand. No oil mess, ease of maintenance and except for increase in price the BEST ALL AROUND FILTER FOR MY USE.
I really like using these AEM air filters. They're reliable and do a good job in keeping that dirt out. I know they sell cleaning kits, but I like to change my filter every 4-6 months, and I've been buying them from AEM for years now.
I love the AEM filters. They're a good cost and last forever if you clean them properly. I personally like to get a new one every couple of months cause that's just how I am. haha