Everything that French said. The topic about glow drivers is alive here on RCU right now. Idon't use them but if it makes the pilot happy then Ihave no problems with them, it's a piece of mind thing. When I install the engine inverted Ido make up my own remote glow driver, Idon't care for the store bought systems at all. Once you have the low end adjusted correctly there really aren't any problems. Ido run OS and YS engines though so that could be one of the reasons Ihave gotten away without adding the drivers?