RiffRaff00

I'm getting a 5100 Bilstein leveling kit installed on my 2011 FX4. I want to put a two and a half rearrear b in the back. Does it have to be tapered? I'm looking at Halo kits now. But I understand Procomp it's tapered kids. Do I need to worry about axle wrap? Also do you think the rear shock on the Bilstein kit will be okay with an inch and a quarter rise. It says it's only adjustable to an inch.