Dodge has officially unveiled the 2015 Challenger SRT and Challenger SRT Hellcat. The latter features a supercharged 6.2-liter V8 engine with more than 600 bhp.

Based on the facelifted Challenger, the high-performance models have an aluminum "power-bulge" hood, restyled headlights and a duck-bill front splitter. The car also has a new rear valance and LED taillights "that can be seen from blocks away."

The Challenger SRT Hellcat goes one step further as it boasts a larger front splitter, a bigger rear spoiler and an exclusive "Air Catcher inlet port which feeds ram-air directly into the engine air box through the driver-side parking lamp."

The Challenger SRT rides on 20-inch forged-aluminum wheels, while the Challenger SRT Hellcat has 20-inch lightweight forged-aluminum wheels with a matte black finish and Pirelli P Zero Nero tires. The latter model is also equipped with the "largest front-brake package ever offered in an SRT vehicle." It boasts 390mm (15.4-inch) Brembo two-piece rotors with six-piston calipers that promise to deliver "outstanding heat management/thermal capacity and longevity."

While the cabin echoes the standard model, it comes nicely equipped with a flat-bottomed steering wheel and heated / ventilated front seats with Nappa leather and Alcantara upholstery. There's also retro-inspired gauges and a 7-inch driver information display in the instrument cluster. Other notable highlights include Hectic Mesh (SRT) or Dark Engine Turn (SRT Hellcat) aluminum trim and a Uconnect infotainment system with an 8.4-inch display.

The entry-level Challenger SRT is powered by an upgraded 6.4-liter HEMI V8 engine that develops 485 bhp (361 kW) and 475 lb-ft (643Nm) of torque - an increase of 15 bhp (11 kW) and 5 lb-ft (6 Nm). Moving up to the SRT Hellcat rewards buyers with a supercharged 6.2-liter HEMI V8 that produces more than 600 bhp (447 kW). Both can be connected to six-speed manual or an eight-speed automatic transmission.

The cars have also been equipped with a "Drive Modes" system which can adjust the steering, traction, suspension and horsepower output. The system has Sport and Track modes as well as a programmable Custom setting that can be accessed through the Uconnect infotainment system.

Speaking of tailoring the performance, the SRT Hellcat comes with two different key fobs. The red key fob enables the driver to access the car's full potential, while the black key fob "limits the driver to a reduced engine output." Speaking of which, both the SRT and SRT Hellcat have a Valet Mode that significantly reduces horsepower and torque to prevent any Ferris Bueller like antics.