Although MINI and Rolls-Royce have the same owner, these two British brands were never meant to share the same styling or performance. A Texas based tuning company name BMP Design was able to fit a Rolls-Royce Allison 250-C20B jet engine from a helipcopter in a Mini Cooper S sports car! You can only imagine what 420 horsepower and 400 ft-lbs of torque feels like in a lightweight car like a MINI. Driving this custom powerful machine must be a challenge, since the driver will have to balance the standard controls, along with the separate levers controlling the fast jet engine. Check out the video after the jump of what a car with a rocket engine sounds like, and see fire shooting out the roof.