Incorrect. Superchargers are belt driven and don't rely on vacuum. Turbochargers require positive air pressure from the exhaust gasses to be driven.... so they aren't powered by vacuum either. It is true that the OBD-II standard is for obtaining readings, but it's also common for manufacturers to utilise this interface to connect to the ECU and make changes to their internal parameters. Take the Toyota Intelligent Tester II. This interfaces via the OBD-II port and can modify parameters within the ECU. Those previous two linked devices weren't from eBay so you make the call. Despite superchargers are belt-driven, they still require vacuum for the bypass valves built/ added to them, for when vacuum drops to 0, that's when they are pressurizing the air by 'compressing' it, thus making boost. (Also known as positive pressure). Its not in the Aurion FAQ about these 'items' you are thinking of getting, but have a look at the ZZE FAQ, its clearly marked in there, or better yet search for threads about this. Evo