Everyone will tell you it can't be done, but Diablo Predators used to let you do it. My 05 RT Magnum has no cats and rear O2's turned off. I plan on doing this to my Ram soon. If you know a CMR tuner guy (hemifever) maybe, he might be able to do it, lets say under the radar. It would be only on an off road vehicle, of course. hehe You will need to swap for a Diablo tuner. If you can't get it to happen, PM me.
Inertia Spartan + cam, Circle D 3,000 stall ,Sonnax line pressure booster, MagHytec 68RE pan,and differential cover, Vararam, JBA's with cut outs, Rancho 9000's, Helwig rear sway bar,3:92's, extra rear leaf,Line-X Bedliner,GY Armortracs, 245,000 miles To Hell and back. 14.2/96 mph NEDW