The ESS Tuning E Tronic Tuner is a plug and play tuner available for the 550i, 650i, 750i, and X5 50i that are equipped with the N63TÜ Twin Turbocharged V8. The ESS Tuning E Tronic Tuner features a multi channel controller that has full integration with the factory ECU and requires no splicing of any wires anywhere in the ECU …