Chrome ignition module vs rev-n-nator

Rev-n-ator is not bad in some cars, I have tested it, and it made a differance down the track. Gained .10 -.20 on same say day testing. Only problem I had is since my car was rewired with a Painless wire system, it will not start on the start mode. The chrome box starts the car every time. Checked wiring and volts, just something about the rev-n-nator. R/T garage sent me a different one samething.