Dragging up an old thread...but this isn't done with the actual OEM taillights, at least I've never seen it. What's done is Whelen Vertex LED's are installed, one in the turn signal and one in the reverse light. Typically one red one white. They're hooked to a Whelen Cencom Core or some similar system which gets inputs from the Canbus network. It's programmed with an event so that when the brake is applied, the red Vertex LED flashes that "strobe" pattern, called SignalAlert or SignalAlert Steady. No modification is done to the OEM brake module, as others have commented this would cause issues with certification. It's considered an auxiliary light, not the brake light itself. Hope this helps. My ST is currently set up this way. Red in the turn signals and white in the reverse. Red comes on with brake application, white when in reverse. I removed the OEM amber halogen turn signal bulb and replaced with an LED to avoid the red conflicting with the amber bulb. And I just like the LED better anyway. Did the same with the OEM halogen reverse lamps. Has worked flawlessly for nearly 3 years now. The non-interceptor taillamps don't have the cutout for the Vertex from the factory like the PIU ones do, but the flat area is still there. Just had to drill a 1" hole and they're in the same location as the factory Vertex lamps if ordered. Only difference is they required screw mount, the PIU ones are twist lock.