I still prefer the Cold Fire(tm) system.....And will be switching back over to it in the spring on the new FPSB sitting in my garage (currently has a Halon system installed)
http://www.firefreeze.com/
Will it be a slight mess when it goes off, yes, will it safe my life (the most important question, as the Cobra can be replaced, my life cannot), yup, you bet the answer is affirmative there as well......
Your car, your choice....Then again, your life, your choice.........
Bill S.