BMW N20 & N26 JB4 Performance Tuner - 220i, 228i, 320i, 328i, 420i, 428i, 528iReady to take your BMW N20 turbo to the next level? How about up to 50hp to the wheels (65hp crank) on a completely stock car or up to 100hp to the wheels (120hp crank) on a fully modified car? The JB4 features a simple plug and play installation harness for easy installation and includes many features not found on any other tune. Including the ability to enable disable the tuning from the driver's seat, gear dependent boost control to help with
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