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The JB4 is the most inclusive B58 tune but also the least expensive. It also can clear tell-tale hidden tuner fault codes automatically which I believe it is the only tune currently on market with this feature. Important for leased applications.
No modifications are needed for the JB4. Just install, it's preset on map1, and enjoy. You can even turn it off in dash if you want. For the B58 installation is really easy too. Two connections under hood, one plug in the OBDII port that feeds out an existing hole in the firewall, takes maybe 20 min total to install the first time. After that 5 min.
Mike
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