I have always had a $12 fire ext. from Wal Mart in my "hobby" cars. A few months ago me a couple of buddies went to the local track for the "Midnight Drags" and I got a chance to use it. We were all together in the staging lanes and there were 3 pairs of us and I was in the last pair. One of the guys has a 5.0 Mustang and he ran in the first pair. When I got the return round his car was on fire from a nitrous back fire and he had no fire extinguisher and neither did either of guys that ran in the pair after him. His car got some paint damage and a little melted plastic but came out pretty good compared to what could have hapened.