Everybody's got an opinion... It pleases me to hear about people considering installing fire extinguishers in their cars, be they halon, CO2, nitrogen, foam, powder or whatever. I personally think a fixed extinguisher aimed at the engine is a very good idea, though I've opted for a conventional manual fire extinguisher mounted in the passenger compartment. I agree with the people who advise that installing an extinguisher of the inert gas type (halon, nitrogen, carbon dioxide)in the passenger compartment is very dangerous because of the near-certainty of asphyxiation during discharge. I've installed a fire-extinguisher in my car. It is one of the foam types, which are extremely messy, but very effective. Use of it would be messy, but I can live with that. I'm sure that any sensibly installed fire extinguisher can help mitigate some risk. If we're lucky, we'll never collect enough data to assess which method is better. Rick Gendreau 11472