Stays Crispy in Milk
OEM is best but I think HiFlo are fine. Just not K&N. They are banned by several race and track organizations. Probably because people used the nut to tighten or didn't get the old o-ring removed but still. I hand tighten mine but I'm very strong and also use hose clamp and safety wire. If anything you could give it a slight snug with a proper filter wrench (again, not using the nut).