The #1 Ford Explorer enthusiast resource for over 25 years! Performance upgrades, maintenance, modifications and problem solving. Covering the Explorer, ST, Ecoboost, Lincoln Aviator, Sport Trac, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Aerostar. .
Register Today It's free! Once registered you can join the Elite Explorers to eliminate ads from the website.
You'll need gt40 p exhaust manifolds and a 98-up egr throttle body elbow, plus you'll need the later PCM which has PATS to deal with. You'll also need a dpfe sensor, hoses and egr tube. Internal egr PCM will not work with external egr PCM, eliminating egr will not only be illegal, but will require special tuning, which is also hard to come by. You are opening a can of worms if you attempt this IMO
I have manifolds off a '99 that I intend to swap at the same time. (That actually begs a second question, If I don't do this swap, will they fit the GT40 heads?)
The EGR is not really a big concern. It's currently throwing a code for insufficient EGR flow (which I assume means the EGR valve isn't opening) and it runs fine. I don't have to do smog checks, so I'm not sure I see any downsides.
I know the combustion chambers are smaller on the P heads, so compression should increase a bit. I would think it would give me some extra power and possibly fuel economy. The P heads flow better too don't they?