[cobrajeff]

Mike -

Sounds like, for your car, I would not put one in the rear. Halon works best in an enclosed area or "compartment" (engine compartment, interior compartment, trunk). If your fuel tank and filler are not in any compartment, you won't have enough Halon to fight a fire outside of an enclosed area - save it for the areas that are enclosed, where it will be most effective.

If your fire system supplier says the 5 lb. bottle is adequate, then I would consider defering to their judgement. When I built my car, I WAS planning on doing more track events. That, plus having been seriuosly burned before, led me to select a 10 lb. bottle.

Jeff