There is an IAT table. Is that what you are looking for?
I have SD headers and had to rtv the crossover pretty heavy too. Tonight I was pulling hard onto the freeway and heard something let go. It was either the rtv blowing out, or an exhaust gasket failed. Not sure cause I didn't have time to look, but it kinda shook me up when it went, got loud real fast lol. I'm about done messing with the crossover and looking for a better more permanent fix like welding flanges for the crossover like the stock exhaust has.