I put the 3" intake covers on my early 99 Superduty.
There were two issues to address:
1- The transition of the intake plenum to the 3" intake covers. I found some adapter connector boots that were 3" on one side, and whatever size it was on the other end to mate up with the intake plenum.
2- The other was clearance between the bottom of the compresor housing on the turbo and the new 3" intake cover. The 3" cover is taller than the original ones. I had to "clearance" ( i.e. I used a big friggin hammer) the new intake cover on the drivers side. I "contoured" the cover to get about 1/16" of an inch of clearance between the turbo and the intake cover.
FWIU, the OBS turbo mounting height and compressor size is about the same as the early 99 Superduty. So I expect you'd have about the same issues to address.