Dodge adds more muscle to the Charger with its 425 HP SRT8 version.  85 more horsepower was unleashed by adding more cubic inches, increasing the compression ratio, redesigning the cylinder head, intake and exhaust systems for increased flow, and increasing engine speed.  0-60 should be around 5 seconds with a 1/4 mile well into the 13s.  To keep all that power in check, Dodge used Brembo brakes which help achieve a 0-100-0 MPH in the mid 16 second range.