The Drag Pak Challengers that have been built by Roush industries are dedicated race cars only and cannot be street driven. They all come with warnings on them stating this.
They only use lightweight glass that isn't legal for street use, and have zero insulation anywhere. There is no heater, windshield wipers, radio, passenger or rear seats, side view mirrors, or gauges in the dash. You get a stripped down, lightweight drag car with no warranties of any kind.
The manufacturers haven't used "chips" to change the tune up on these cars for years now, everything is monitored and adjustable using a laptop at the race track.