I saw an intake heater on a cummins, it looked reasonably compact, I didn't get a chance to take it apart however. I'm thinking its a bunch of non-delicate heating elements (possibly coils) optomized for air flow?

Anybody consider ditching the glow plugs and going this direction?

If I was to try it, I think Id try to suspend it from the air filter cover. Use a big ass relay and control it manually.

I think its superior to the glow plug system because of the centralization and the reduced number of parts and wiring.

__________________
Cheers,
Robert