Been reading some stuff over at ford-truck.com Reading a lot into a "catback" exhaust system. What the hey is that? An exhaust system that bypasses the cats? Speaking of bypassing the cats, could I do that, totally remove it if I could find someone to do it? Would that give me some more oomph in a 01 5.4 4x4 truck? I know I'll have to get some MIL Eliminators to fool the O2 sensors that run in the back of the cats, but would it be a help, hinderance or a pain in the @ss?