What one modification can you do to your car that will make other owners of the same car furious?

For me, I can keep my car at the stock height, change the Mustang bumper out for a Cobra bumper, maybe turbo it, put neon lights under it, and best of all (something I actually might do as a joke) is taking the Mustang logo off the front grill and replacing it with the Ferrari horse.What about you? via /r/cars http://ift.tt/2tcNOT3