Originally Posted by JEEPIT-G
Well I have to do something because I have a bad pre cat and a cracked header
the 05 exhaust manifolds are a two-piece cast design. i highly doubt they are cracked. you likely just have an exhaust leak at the flange to the main cats.
get a Walker Exhaust direct replacement downpipe w/ all three cats, new bolts, and simply torque them to spec.