different Air boxes for 86. one for carb, one for pulse air injection , one for smog pump equipped, and no one knows which is which but folks like us.The exp could have any number of the regular escort motors aside from the diesel, the air box, cat, plugs, shocks, struts and so on are all the same. The problem is that the exp tends to be more optioned out so trx suspension package and the ho were far more common on the exp. The only real difference on the exp was the body and door panels. The exp is modified 2 door sedan so the doors, panels and most of the body work is different. Mechanically there the same.