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JB4 adds several additional points of failure to the car and spams the canbus while hijacking...2 sensors. On the other hand a MHD (or any other good flash tune) modifies over 100 factory maps in the car's engine computer that ALREADY exists and ALREADY has full authority over the engine. Why would you add something to control the engine, when the car has something that can do this with just a reprogramming? Beats me.
Anyone who uses a JB4 in place of a regular flash tune is misinformed and victim of an inferior product. JB4 could be useful for exotic things like auxiliary fueling, nitrous, water meth, but are you running any of those? Even in that case, you would COMBINE the flash tune with the JB4 for best performance and safety.
In conclusion, ditch the JB4 as fast as possible and get MHD.
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