Vehicles built before 12/7/98 are considered early 99 and vehicle built after 12/7/98 are considered late 99. (You can also contact Ford with your VIN to verify the up-pipes on your truck vs that which is found on the latter 99.5 trucks to be 100%.)
The XDP 7.3L BELLOWED UP-PIPE KIT XD178 will fit the Excursion.
The XDP 7.3L BELLOWED UP-PIPE KIT XD178 is ONLY designed to fit the following applications: 1999.5-2003 Ford 7.3L Powerstroke.
Yes, the XDP 7.3L BELLOWED UP-PIPE KIT XD178 will fit a 2002 E350 7.3L.