According to RK, the owner put in his own engine as the company which built it was restricted by law to sell it with a complete powertrain. He chose a powerful Roush Performance 427IR engine and coupled it with a RBT ZF six-speed manual gearbox. The rear-mounted engine is capable of putting out 560hp and 540 lb-ft of torque. RK Motors said "This GT40s interior is every bit as nice and authentic as its fiberglass body." It includes bucket seats that resemble the original car, plenty of leather, 200mph speedometer and black carpet. The classic ford has a black interior which contrasts sweetly with its Sunset Red exterior finish.