An SRT8 version of the Charger debuted at the 2005 New York International Auto Show. Powered by a 425 hp (431 PS; 317 kW) version of the 6.1 L (370 cu in) Hemi V8, it also featured upgraded Brembo brakes, and interior and exterior updates.

The engine is rated at 420 lb⋅ft (569 N⋅m) of torque at 4,800 rpm. The 425 SAE net horsepower of the modern 6.1 L Hemi makes it more powerful than the Chrysler Hemi engines of the muscle car era, the biggest of which were rated at 425 SAE gross horsepower. This made the 6.1 L Hemi the most powerful V8 engine that Chrysler had put in a production vehicle at the time. The SRT8 can accelerate from 0–60 mph (0–97 km/h) in 4.8 seconds (5.0 average).

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