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Yes, xHP will work on JB4 equipped cars, but you have to remove it before flash and install again. On our test cars setting JB4 to Map 0 was not enough, as JB4 was still disturbing communication to the TCU. This possibly depends on the JB4 revision you are using.

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Do I need to do a driving-in-phase?

We do recommend around 50-75 miles of driving without wide open throttle, with as many speeds, load scenarios and shifts as possible, so the transmission can adapt to the new software as fast as possible.

This driving-in-phase is only necessary after the initial xHP flash and not needed for subsequent flashes, like map changes or different custom settings etc.

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Will xHP void my OEM or dealer warranty?

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