Here is an interesting cosmetic add-on for your motorcycle, car or truck. The Tailgunner exhaust is like the spinner wheel fad for your exhaust pipe. Only it is in the shape of the business end of a minigun. When the car is running, the pressure from the exahaust spins the faux barrels as the gas exits the pipe.
As an R1 FD3S owner, I find this to be in poor taste. But people have different tastes than I do and I respect that.