Scott I know the hall and Q pipe all used Rtv on all the exhaust joints.

I've got some (dare I say it) Hondabond, which has proven to be the best high temp RTV I've ever used. I'll definitely put some between the exhaust flange and head pipe, but after getting a Duncan Racing billet exhaust coupler on my ATC build, I just want something that solid on the zilla to join the head pipe and silencer as well to guarantee no leaks and look good as well.