I have the mac lt's, nice fit, does't rub anywhere or hang down too low. It took my ford mechanic 6 hours to install, when he was putting in my new engine, (ford had to replace my engine with 140 miles on it) I would get the ceramic coated if I did it again, although they told me they discolor.
There are three companies that make LT headers that will work with the automatic: MAC, Kooks, and Hooker. I bought the Hooker headers with the o/r x-pipe and they work great. I gained 23 rwhp with these mods.