The Mustangs from 87-93 have an ACT (air charge temperature) sensor that is installed in a tapped hole in the #5 intake runner. The Explorer intake does not have the hole drilled or tapped because they had the ACT sensor mounted elsewhere. There is a boss on the #5 runner but it hasn't been drilled and tapped for the sensor. So basically you would need to drill and tap the boss on the #5 intake runner if you wanted to keep the sensor in the stock location. Lots of guys, myself included move the sensor to the air box.
As for the other note about the EGR coolant passage. The Mustangs have a drilled and tapped hole with a barb fitting in it on the passenger side rear corner of the intake manifold. So you have coolant hose from a fitting on the hard heater line going into the EGR spacer and then you have a coolant hose leaving the EGR spacer and going into the fitting at the back of the intake. This provides a loop for the EGR coolant. The Explorers had a different EGR set up and did not have this spot at the back of the intake drilled and tapped. So like with the ACT sensor you would have to drill and tap that spot as well.
The price is pretty good, IMHO, for an explorer intake and I like the blue accents.