If you don't have the STP option, you could add the Cop rear sway bar they use. I found the part number today when I had my Mopar'10 with SuperTrackPack up on the lift. The STP rear sway bar in red is heavier than the SRT/RT bar, and seems to work pretty well.
P04782544AC > Front Sway Bar = R/T & SRT&Police Pursuit Package P05180016AA > Rear Sway Bar = STP & Police Pursuit Package PO4782873AB > Rear Sway Bar = R/T & SRT
Or you could just go the full after market route... but since I found the STP PN, I figured I'd share it.