Thought I'd chime in on this:
I recently had the Dynatrac front big brake upgrade installed on my 2006 SMB. The kit includes everything from the knuckles out, including bigger rotors and calipers. It's expensive (~$3,000).
Results: I'm glad I got it, but the results aren't going to blow your mind. Pedal feel is still pretty soft. Stopping power is significantly improved, but feels more like the van probably should have felt in the first place. Don't get me wrong, it is much more fun to drive now. But I think to make a truly mindblowing impact, it needs the better pedal feel that you can only get out of a hydroboost conversion
, so that is next on my list of planned upgrades.