The GT40p's also do not have the air ports in the back of the heads for the cross over tubes. Ford and BBK shorty headers will work on both GT40 and GT40P. The BBK aren't designed to work with the p heads and have some clearance issues, which will end up costing some additional money and time when changing plugs. If you plan on upgrading to aluminum heads in the future. You will still be able to use both of these headers, as well as MAC and BBK longtubes (other longtubes will probally work but I'm not sure which ones) with other heads besides the GT40P's and save you some money when you upgrade heads, because you won't have too buy another set of headers. Total cost for the heads will be whatever you pay for the heads plus $150 for a trickflow spring upgrade kit plus $20 for a Sears spring compessor tool. If you can pull the heads yourself, they are a good low buck upgrade. If you can't pull them yourself, then the cost of the heads plus shipping will be too much and not worth it. Late 95 to 97 1/2 Explorers have GT40 heads after 97 1/2 have GT40P. GT40's have 3 vertical lines on each end of the heads, GT40P have 4 vertical lines. If you can pull them yourself, pick up the intake manifold too. On the front of the lower intake manifold, look for a part # that ends in BA. These intakes also have a small round hole in the middle of the intake runners. These are the more desirable Explorer intakes because they have the egr provisions and can be tapped for the act and coolant lines. Either head would suit your car. The GT40P have a smaller and revised combustion chamber and will increase compression ratio to approximately 9.5, they also flow slightly more in stock form than the GT40'S. GT40's also cost more than the GT40P's.