im thinkin bout getting the cats back i was thinking magnaflow high flows i have a 2inch pipes also true duals straight out the back

 

SAS= solid axle swap. Replacing the TTB with a solid axle. Long tube headers get in the way of brackets and other items needed to complete the swap.

Cat back systems on these trucks are pretty useless. You could do the entire system, y-pipe back, for about the same or even less as a cat back system. The Bassani y pipe with a cat, Muffler of choice and single 3" pipe would be under $500 easy.

 

What is involved with bumping the timing to 13.5°?
Great info. I have 2 of these trucks with 5.0's. And am about to perform upgrades.