Here is my P-38 with (2) 100s on it. Turn you volume up
.
www.youtube.com/watch?v=5hd6bLMXHPs
I also have (2) 91s and a 72, all in planes that fly regularly, and all but one 91 is inverted. None have or need on board glow.
Adjust them properly, tighten the muffler when the engine is at operating temp, and you don't have any worries with Saito.