BMW E Chassis N55 JB4 Tuner for 135i, 335i, X1, X5, X6 - Burger TuningN55 Power gains of up to 60hp and 60tq to the wheels on a stock vehicle How about up to 60hp to the wheels (80hp 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 & play installation harness for easy installation and includes many features not found on any other tune. Including on the fly in dash map switching between factory and various performance maps, optional in
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BMW E Chassis N55 JB4 Tuner for 135i, 335i, X1, X5, X6 - Burger Tuning