Charger/Challenger/300C have the SRT-8 option (V8 “Hemi”).
The SRT-10 would be a Viper (or the Ram with the Viper V10).
You are correct.
Sort of.
The Challenger SRFT is a concept....
http://www.motorauthority.com/dodge-unveils-challenger-srt10-concept.html
Raring up for the 2008 SEMA show, where a handful of tuners will offer their interpretations of the Challenger, Dodge has let the covers slip from its own 2009 Challenger SRT10 Concept. Rather than taking the supercharging route that most of the tuners have been going with for the Challenger, Dodge decided to leverage its Viper division for a one-of-a-kind vehicle.
Powered by an 8.4L all-aluminum V10 engine rated at 600hp (447kW) and 560lb-ft (758Nm) of torque, the Challenger SRT10 Concept also gets a Tornado Red paint job and a carbon fiber trunk lid. Bilstein shocks improve handling while upgraded brakes help bring the big car to rest from speed. Inside, the car gets a sampling of carbon fiber accents and, like the Viper, a red push-button engine starter mounted in the dash.
more...