Compared to a stock Viper, the ACR adds aero, brake, and suspension changes. Autoclaved carbon fiber forms the wing and “fanged” chin splitter (a removable extension trims it back to street legal), as well as cheek-mounted dive planes. Spring and anti-roll-bar rates are elevated, and the ACR is fitted with forged aluminum wheels and track-ready Michelin Pilot Sport Cup tires that shave 60 pounds from a base Viper. It punches out of corners with a feral roar and tracks through fast sweepers with wind-generated stability, race-car-rigid body control, and sticky-rubber grip. This car has proven that it will be played with for many, many hours before boredom sets in.