The new EWG connections allow the JB4 to directly add and subtract wastegate duty cycle (WGDC) from the wastegates providing additional tuning flexibility. Most useful for modified vehicles that are having problems targeting boost properly and will also improve boost response, spool up, shifting performance, and overall feel.
Installation involves plugging the wires in to the JB4 harness, updating the JB4 firmware and settings, and attaching them to the wastegates which are relatively easy to reach from the engine bay.
Note JB4 models shipped prior to Oct, 2019 may also require an updated 2580 master chip (available here) if EWG wires trigger a startup fault code that clears until restarted.