That resistor will save your ignition box from melting the epoxy from the back side of it,i know this for a fact!!This car was running and driving for years until....
Had a stumble above 5500 rpm removed ballast, stumble gone problem fixed.
Week later cruze night car quit,open hood black ooooz running down the fire wall.
Had a dizzy problem causing the stumble.Replaced the dizzy and the box,installed a new ballast.

Run the ballast resistor,it is there for a reason