Can't run the UMI k on mine unless I do an engine swap from my silly V6, but I run another brand that is a road race reinforced one. The tube crosses in a full hoop frame rail to frame rail so no failure points introduced 1/4 way through like I've seen on some k-members where it's made of sections of piping/brackets.
I've daily driven mine on rough friggin roads with some auto-x on street tires without any issues and I'm the second owner of the k-member. There's tons of room to do work on the engine now and can pull the oil pan without having to drop the k-member. The rest of the stuff is predominantly UMI or Strano centered on the car, barring that BMR cross member (was the easier/cheaper one to buy and modify for the T-56 conversion).
(IMG:
http://i10.photobucket.com/albums/a141/WarShrike/12322603_1094478317275685_6604595412783977762_o_zpsfzbfhv5q.jpg)