Unlock the true power of your Mini Cooper JB4 Software tuning software available at Sport Ignition. JB4 is one of the most advanced and flexible piggyback tuning solutions on the market, offering safe and powerful performance enhancements for turbocharged Minis. Easily adjustable for different fueling and boost maps, this software helps you optimize horsepower, improve throttle response, and tailor performance to your driving style — whether you’re after everyday fun or track-ready power.