Yasssss

Well, with modern-day vehicles... You'd have o pay for the gun, itself. You'd need some sort of actuator, wire, & a toggle switch.

...Or, something as simple as a manual choke cable, & a metal hook. A Skilsaw jigsaw will take care of that stupid plastic fake intake, then you just need a couple mounting brackets. Pretty cheap, if you can get a deal on the minigun.