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The little Mini is as aerodynamic as a toaster and above 100 MPH the aerodynamics will play a very heavy hand in a cars acceleration and top speed. Your R/T is far more aerodynamic than that Mini. The Mini's biggest advantage is it's weight, so when you are refering to top end and acceleration it's very square box shape kills it.
I've got a few of those stickers myself, but I have yet to put one on my cars.