Has anyone tested different brands of direct replacement in-line fuel filters for 86-87? If so, when testing, noticed a pressure drop from one brand to another? Cut the filter open to see who's got the most pleat surface area? Fram G3727 available at WalMart for $11.95. Original AC Delco GF652 about the same price @ $12. Purolater or WIX option also. Suggestions?