Purolater isn't bad but, I have noticed those filters bleed down easier after sitting all night which sometimes on certain engines will cause a few seconds of clattering. I have noticed with WIX you don't seem to get that as much. I prefer Wix myself and price really isn't much different at all. Napa has the premium NAPA gold you mentioned and its only 6 bucks compared to 5.88 for the gold Purolater at Pep Boys. Either will probably suit you fine the 4.0L and 5.2L has mentioned are very stout engines. I know I love my 4.0L torquey as [censored].