i have a proform electric pump on my 408. when i was driving it on the street, it worked as good as my mechanical pump did, but i never took it on any long drives at highway speeds (15-20 min cruises around town at 30-50 MPH). it's great at the track because you can cool the motor between rounds by running your pump and fan for a few mins. the HP gains are debatable. aside from all that, i'd do it just for the looks alone.