Verdict on Hooker LT's is still out.
#1 From the pictures I've seen when looking to order them, they have a bolt up collector for the x-pipe, making THEIRS necessary
#2 they don't have a catted x-pipe
#3 The cat-back end of their x-pipe is a slip fit end, so I think you'd have to modify any cat-back to fit it (weld?)