Welcome to TDR TroyWood.
I am of the opinion that K&N air filter are no good for all the reasons stated above. More importantly then that is that if something happens to you engine, your warranty could be denied. The same holds true for AFE filters, which IMO are much better. Dodge and Cummins frown on these after market filters and deny warranties all the time. The best advise I can give you is to keep your engine stock as long as you are under warranty.