Maybe you can do it. First, the socket for the lower bulb would have to be changed to accept a dual-filament bulb. Second, the green wire (which goes to the brake lights) comes from a module called the brake light failure sensor, which is located behind the right-hand headrest-storage panel in the rear storage compartment. I don't know how this sensor's circuitry would react to double the normal current draw every time the brakes are applied. Third, the brake lights share a 20A fuse (fuse 47)with the horn; double the brake-light current along with blowing the horn while braking MIGHT blow the fuse.