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Jalopnik have published a "test driven" review of the Hennessey VelociRaptor 600. 'The formula for the Raptor isn't much different from Hennessey's general approach to their products: lots of forced induction plus lots of fine-tuning. In this case it's two 58-mm turbos with 44-mm wastegates mounted in the truck's reinforced bumper with a pair of air-to-air intercoolers located behind the black plastic grille blowing air into the new 6.2-liter V8 and out a stainless steel exhaust. Essentially, it's a giant bolt-on kit. Power's conservatively rated at 622 HP with 638 lb-ft of torque, compared to 411 HP and 430 lb-ft of torque for the base 6.2-liter V8.'