It's basically the Kicker audio system.
AY2 SRT OPTION GROUP II- 13 SPKRS KICKER SRT HIGH PERF AUDIO
- 200 WATT KICKER SRT SUBWOOFER
- 322 WATT KICKER SRT AMPLIFIER
- AM/FM 6 DISC DVD MP3 RADIO
- INSTRUMENT CLUSTER WHITE FACE W/TACH
So upgraded radio if you are NOT getting MyGIG (otherwise MyGIG overrides that radio since MyGIG is better), white face tach, and the 13-speaker Kicker Audio system. I want some bad-arse tunes going through my Challenger, so I'm definitely picking this option up.