from what i've read adding nitrous is almost better then adding propane (adding both sounds like real fun) Nitrous is just an oxidizer. two parts nitrogen one part oxygen. at 375 deg they seperate the nitrogen cools every thing off and the oxygen burns more fuel. and since it's impossible to run a diesel lean, the more the better (as long as you have unburnt fuel) it really helps with dragracing. had it on my SVO (turbo charges 2.3L with a five speed) worked great for spolling the turbo a bit before a drage race.