JB+ Tuner for Mercedes-Benz 2011-2017 W204 SLK 250, C250 and E250 420i (G23) High flow to eliminate crankcase

High flow to eliminate crankcase pressure caused by more restrictive designs

Designed for superior airflow and engine efficiency

Perfect for enthusiasts seeking efficiency

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JB+ Tuner for Mercedes-Benz 2011-2017 W204 SLK 250, C250 and E250 420i (G23) High flow to eliminate crankcaseInstantaneous increase in Power and Torque! Take your gasoline powered SLK 250, C250, and E250 to the next level with this simple plug and play tuner. Increases torque and power across the power band with the most noticeable increases coming at lower RPM and throttle positions where you really need them. In addition to adding power and torque it reduces turbo lag and improves throttle response. Gains are up to 20 hp to the wheels and 40 torque to the