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The DeBerti Mustang does not come with any OEM Mustang engine swaps. The only V8 engine swap available is the 8.9L V8 DSC from the Bone Shaker monster truck. It can only be detuned to 640hp with the 8.4L V10 engine swap, which is from a Dodge Viper.
Adding the 5.2L V8 as an engine swap option for this car would not only be an OEM Mustang swap (from the 2016 Ford Shelby GT350R), but would also comfortably bring the car down into A class.