I don't use them on street cars because i don't think they filter as well as I'd like for normal driving. But on two of my cars i use a reusable filter, but with better filtering ability.

 

Well that undocumented with proper testing and empirical data information gets used often on forums all over the world. So exactly where did you get your information and what do you think constitutes an air filter that without losing less then CFM capacity of an engine can filter out anything that may wear the cylinder walls or rings on any engine in less than 100,000 miles or even 500,00o miles. LOL And as I often point out K&N R&D facility has one of the worlds top air filter testing equipment. K&N also has an open invitation for any other air filter manufacture to come and test their filter against a like K&N and will publish the results. To dates after decades only a very few have ever wanted to except that challenge and didn't even equal K&N overall. Sure there are a lot of claims and supposed testing but you have to ask why not take K&N up on the challenge. Why because they don't want the published results. Who wants to buy a air filter that is "almost" as good as K&N?? lol


My quote and see the pictures # 20 ubove in this thread , quote " After letting the air filter wick out over night a little touch up of missed area of the new oil and I was almost ready to re-install. I wiped the inlet pipe just in case, but as I already knew not even worth mentioning, not a single bit of dirt. Lol. So the air-filter is clean and all back in its place under the MAZDA hood."


I should also mention that I first used a OEM ,K&N air filter when I was still using the OEM airbox. This is also on my thread. The results of its filtering were also the same as the open cone filter currently using.

 

I too am a sub of Project Farm. The vid you are referencing is very informative. I especially like the most recent one where he compared the Pennzoil brands.