Stroud Safety fire suppression systems use the Novec 1230 Suppressant in their replacement bottles, which is SFI-approved for drag racers and all motorsports applications. With this gas-based system, all you do is open the car doors and let it vent for a bit, load your spare bottle, and go run. Whereas with a foam-based system, you have to clean the foam out of the entire vehicle and you're down for a while. Stroud believes gas systems can reach areas of the car much quicker and cleaner than the foaming systems. You'll want to stock spare bottles for the times you need a replacement.