BMW B38/B46/B48/B58 JB4 Tuner

POWER GAINS OF UP TO 100HP WITHOUT THE RISKS OF FLASHING! If shipping to a California address, please select CARB compliant variation The JB4 is the most fully equipped tuning system for your B58 and B48 vehicle currently on the market. For a B58, bolt-on parts, higher octane, E85 mixtures, and larger turbos can increase power by up to 80 horsepower to the wheels (100 horsepower crank) and up to 40 horsepower to the wheels (55 horsepower crank), respectively. The JB4 includes many features not found with any other tune and comes with an easy plug-and-play installation harness for easy installation and removal. In-dash gauge displays for boost are an option, as are boost limiting by gear for better traction in lower gears, progressive water/methanol support, built-in data logging, built-in code reading, an optional direct EWG control to prevent throttle closure with exhaust modifications, exhaust flapper control, and many other features. JB4 Map Guide: Map0: Stock tuning, fully disable