The pipe has to go somewhere. With my headers as long as they are I can't go over the driveshaft. I can't do duals without rerouting my fuel some other way. I can move the crossover back a few inches more and get some more clearance, but I bet it'll still hit. Blue85 said he was having clearance issues with the crossmember itself.
I can't really imagine a scenario where I could hang the truck by the frame and have the springs be the limiting factor, including driveshafts less than 30 degrees. The rear will always be shock limited.
Crazy articulation is cool and everything, but I got the ORD springs so I could have a smoother ride and drive rocky washboards without my fillings coming out. If limit straps will let me get back on the road and stop fussing with this thing, that's the route I'm going to take.