I just want some feedback on which is better and why. I am looking at the hp they make. The overall cost. The long term damage. I am also wondering about the overall safety factor. I'm not richard prior. I thinkn nitro gives the most bang for the buck. I have recently seen a couple video's of gas powered vehicles bursting into flames. I didn't like that thought. Propane again highly combustable. I have heard some bad opinions regarding this matter. I also heard that the propane being -30 degrees is good since it cools your cylindar walls. He has a kit on an older powerjoke and it has been in place almost 4 years he loves it. Said it gave him like 120 hp something like that. Now for the damage how much integrity of the engine is compromised for a sparatic user. Or do you wanna keep the propane all the time set up less aggressively. I'm under the impression u cannot do both at the same time. thanks for anything u can tell me.