07-21-2011, 11:48 PM
i can only recommend what i did with the Explorer swap. GT40 factory upper/lower. The A9 works fine with it. You will have to modify the IAT sensor location, and probably lengthen the wires for the IAB and TPS. I ended up running a 70MM MAF that Viper recommended on classic. I think I got it from a 94 Town Car (can't recall for certain- it has been a while). The stock Explorer MAF isn't compatible with the A9 computer. Your stock 91 should have 17lb injectors. The Explorer comes with 19lb injectors, hence the bigger MAF. I used a stock Explorer intake elbow with the IAT sensor in it. The stock Explorer lower intake does not have a hole for the IAT, but you could drill/tap it for one.
Don't know about mileage. Probably won't be much different. No compatibility issues that I have run across. If you are using GT40 heads, you'd probably have to get a 96 or 97 only 5.0 explorer. The 98 like mine has P heads, but I am running the stock Explorer manifolds and have been very happy with them. No clearance issues w/a C-4 behind it, but I am running a floor shifter. They do appear to have similar outlet locations to the BC Broncos headers, which are supposed to fit everything.
Regardless, all of it you should be able to source used or from a boneyard for cheap. I am a big fan of the Explorer serpentine setup as well.
Don't know about mileage. Probably won't be much different. No compatibility issues that I have run across. If you are using GT40 heads, you'd probably have to get a 96 or 97 only 5.0 explorer. The 98 like mine has P heads, but I am running the stock Explorer manifolds and have been very happy with them. No clearance issues w/a C-4 behind it, but I am running a floor shifter. They do appear to have similar outlet locations to the BC Broncos headers, which are supposed to fit everything.
Regardless, all of it you should be able to source used or from a boneyard for cheap. I am a big fan of the Explorer serpentine setup as well.