Every Mopar I have ever owned (or currently own) ran better using them.
Old Mopars- all my Chargers, Trucks and current 5th ave- standard copper Champions as called for by the service manual. Newer Mopars- my SRT, Caliber, Stratus- same as above. But I did use Champion Platinum in the SRT and Caliber. Stratus has the good ol' copper ones.