Although many people use either the K&N or the HighFlo 152, there are some nipple-fitment differences that IMO put the engine at risk because of possible by-passing. Know that it has not happened..at least not to an extent that an engine failure has been directly linked to it...yet. All it takes is one particle to get by larger then the rod bearing clearance to damage it. You are always safe using the CFM oil filter. This is what I choose to use as well.