Ferraris are what one might call a high risk car regarding fire, lol, possibly the understatement of the century. They're right there next to lambos. The newer cars are a lot better than the older ones, but you still see enough burned 360s online to think about putting an extinguisher in the car. I carry a full size ABC in my jeep, in the 308 I have a 2/3 size ABC in the trunk (whatever you call that compartment under the rear bonnet, behind the engine). The trunk isn't as good as inside, but I'll take my chances that I can get to it rather than have to deal with it in the driver's compartment all the time. btw, I was a firefighter, well on rescue actually, for about 5 years. You could no longer pay me to not carry a fire extinguisher. Come to think of it, I actually watched a Ferrari burn to the ground once in someone's driveway. We got there in a reasonable amount of time, but the mag wheels went up and you aint gonna put them out, just let them burn and try to keep the rest of the car from going up which is near impossible. And no, in real life cars don't blow up like they do in the movies, or at least I have never heard of anyone around me doing so and there have been enough car fires that if it happened that much it would have happened at least once around here. Wow, too long of a story, sorry guys. I would throw a small estinguisher in the trunk of the 550, you have so much storage room anyways (relatively) and it would be away from the normal sources of fire so you could get it easily.