Finished the exhaust. Realized in bed last night that I completely screwed up the spring tensioners on the exhaust pipe halves. I was placing the springs between the manifold flanges; I rechecked this AM, and the springs go on the END of the AN3-13 bolts. What a difference in fit!
So got them bolted up; installed cotter pins in each bolt, then used the supplied clamps to hang the end of each pipe to the lower motor mount tubes.