The design features of the street model have been incorporated into the Cup model.
Ralph Gilles, president and CEO of SRT Brand and Motorsports said:
From the start, it’s been a collaborative effort with NASCAR. NASCAR provided the manufacturers with basic specifications, but offered encouragement to venture beyond the look of the current race car. Our design and engineering group, working with Penske Racing, seized the opportunity. We had a fantastic benchmark – the Dodge Challenger – introduced in 2009. This endeavor goes beyond the trend the Nationwide Series Challenger started with a Dodge Charger that amazingly embodies many of the design features of the street version into the race car. We’re extremely proud that the Dodge Charger street car is the only rear-wheel-drive model in Sprint Cup competition that is available with a V-8 engine.
As part of the 2013 rules package governing Cup cars, NASCAR eased the rules on where manufacturers were allowed to put glass and solid body parts. NASCAR also eased rules on the front and the rear of the cars, allowing manufactures to make the nose and rear of the car look more like the production model. The sides now allow character lines that come from the street models.
NASCAR President Mike Helton said:
We know NASCAR fans are passionate about cars. We’re excited about the results of the collective efforts of NASCAR, Dodge and the other manufacturers to create the 2013 Sprint Cup cars. The 2013 Dodge Charger race car design is a great example of what we look forward to seeing on the race track next season. We thank Dodge and all the manufacturers for their efforts, as we see the results here today with the 2013 NASCAR Sprint Cup Dodge Charger.
The unveiling comes on the heels of an announcement by Penske Racing that the team — the only powerhouse team that fields Dodge chargers — would switch from Dodge to Ford in 2013 . This leaves Robby Gordon Motorsports as the only team that currently fields Dodges. Richard Petty Motorsports indicated that they were approached by Dodge  to run the 2013 Charger.