I just want to mention, I have nothing against K&N. In fact, I have their air filters on both my Healeys and my '96 Ranger. The OP wanted to know what others are using and I think the 12-pack of Wixes is a good deal--NFI--since I use them on both my Healeys. I seriously doubt the K&N filters are worth the premium, but can't prove it. The fact that Wix states 'no warranty' on their race-only filters is prudent; else every racer who blows an engine would want a new one from Wix.