The all-new Challenger SRT8 has just hit the streets with its 6.1L Hemi V-8 and in traditional fashion HPE already has performance upgrade packages available. Despite packing 425 hp, HPE knew that many Dodge Challenger SRT8 buyers would want improved power and performance to make their new hot rods even hotter. Now Challenger owners can have Viper and ZR1-like power in the form of 620 hp and 650 lb-ft of torque.
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