Mopar Collector's Guide Magazine has quite a write up on a company (The Group Five) that has developed special Challenger versions that could be ordered through your local dealer. There supposedly will be a G5/S, G5/SC and G5/R - all being different "upgrade" packages. The G5/SC is a Supercharged version, but other will have enhanced brakes, suspension, exhaust, hoods & Shaker and sway bars. In addition, some interior changes (not described) as well as bolder graphics. The G5 group is intending to work like Roush does for Ford on the Mustangs.
I went to their site
www.g5challenger.com but did not see anything out there yet.
Mopar Collector's Guide is saying late '08 and that this process is far beyond "sketches & drawings".
Could be very cool!!! Stay tuned...I intend to