I've head a lot of interesting stuff on here, but this is just plain ludicrous! Anyone who wants to feed highly flammable propane gas into their cylinder head instead of good old O2 (or N2O, for that matter) needs their heads read. It'll certainly cause a 'bigger bang' in your engine, and no doubt, will result in increased performance from the engine. That is, until the piston rings melt and the head cracks.