smcneal, just got this email back from Random Technology on the high flow cats...
Out universal fit converters sell for $200.25 each. All you need is the diameter of the pipes to which the converter will be welded. If your truck will pass inspection with stock converters, it will pass with these. http://www.randomtechnology.com
might want to go this route... also All Hyundai & Isuzu Auto (888-944-7898) to see how much they would sell me the cats for... $275 each... not too bad. http://www.allhyundaiisuzuparts.com
-Dave