Never seen such a thing until this. I keep getting TSB notices begging me to bring my Challenger in for cat replacement and reflash. The ONLY way I would entertain it is if they 1. supply ME the new parts; 2. I would certify I installed them; 3. they ain't getting the old ones back, AND 4. don't even think about touching the computer. Otherwise they can go take a flying leap the F outta here.