BMS JB4 N54 TunerUpgrade the performance of your N54 powered BMW with a Burger Motorsports JB4 Tuner! Looking to bring those horsepower numbers up on your N54? Well then a JB4 is right for you! JB4 adds up to 80hp to the wheels (100hp crank) on a completely stock car, and up to 160hp to the wheels on factory turbos, or even further, up to 350hp to the wheels on a fully modified car with larger turbo(s)! The JB4 includes a simple plug and play installation harness and
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