Okay, so here's the deal.
I finally got a Banks kit off ebay. Got everything but the exhaust behind the downpipe (truck taco'ed). All done (NOT EASY) except for the exhaust. I live in the Seattle area, and shockingly, there is only one place that does mandrel bending. Local shops can crush bend 3", but won't even touch 4". Mandrel bender want's and absurd amount for a 4" mandrel bent exhaust.
So here's the deal: I got the 3" downpipe. Reasonably cheap 4" mandrel bent exhaust can be be bought for the 6.5TD, newer body style suburban. Would the bends, especially around the rear axle, work for my 1991 6.2 suburban? Would love to buy one of those and throw a local shop a little change to do the welding/adjusting. (now I want a MIG welder for Christmas!)
Also open to 3"/4" comments!
Boring footnote: I felt this belongs in the 6.2/6.5 Tech thread, but apparently I don't have permission to post there. Admin feel free to move if appropriate.