"The recipe for the Charger SRT8 is familiar: Bore out Chrysler's modern-day Hemi V-8--already a formidable source of power, torque, and retro rumble for more than one million buyers in all its many applications--to expand displacement from the stock 5.7 liters to 6.1 liters. Raise the compression ratio, and fit higher-flow cylinder heads and a new intake manifold. Step back and revel in 425 hp and 420 lb-ft of torque, a 70.1-hp-per-liter rating that exceeds that of the original Hemi, with modern (i.e., realistic) SAE net power ratings to boot."
2006 Dodge Charger SRT8 - Automobile Magazine