Customer Rating: Summary: K&N!!!!!!!!! Comment: Reason for buying this is for the NUT on the end of it, I have had MANY times where it couldn't get one off without the NUT :) Customer Rating: Summary: This is what I only use Comment: I use this product for both my mustang (306 stroker) and for my everyday ride. Might just be me but after a couple thousand, I noticed that my engine oil (mobile #1 synthetic) seems to look almost new when I check the dip stick????