the Drag Pak is back, factory race cars not street legal to remind the Mustangs and Camaros that true competition is still around, this time, with factory supercharged Hemi power

Supercharged 354 or natural induction 426 engines

http://bangshift.com/bangshift1320/mopar-unveils-new-drag-pack-challengers-blown-and-naturally-aspirated-combos-available-look-out-ford-and-gm/