More Horsepower! The HEMI powered Challengers come with very respectable horsepower and torque numbers from the factory, but after installing a Hellion Sleeper Twin Turbo Kit you will be planting a tire shredding 500 to 2000 horsepower to the pavement - depending on custom tuning and fuel upgrades.Tuner Kit. The Hellion Sleeper Hidden Twin Turbo Tuner Kit comes with two Turbonetics 62mm Turbos and all the required parts and hardware needed to upgrade your Challenger in to a wild snarling beast. Please note that custom dyno tuning is required for operation. Does not include fuel system upgrades (injectors) or programmer.Not CARB Certified. This Hellion Tuner Kit is not CARB certified, therefore it is not legal for use in California or other states adopting California emission standards. Not legal for use on pollution controlled motor vehicles; not intended for highway use.Application. This Hellion Sleeper Hidden Twin 62mm Turbo Tuner Kit is designed to fit 2008-2022 Dodge Challenger models equipped with the 5.7L HEMI, 6.1L HEMI or 6.4L HEMI engine.Please Note. Hellion Turbo Systems are built to order for our customers and accordingly, we require you to submit additional information about your vehicle using this form. Because of this there can be a 5 to 7 day lead time on orders once your information is received.Once the Customer Information Form is filled out, please email it to support@americanmuscle.com with your Order Number in the Subject line, so the order can be processed.