Oh boy......bottle rockets aren't powerful enough to move your car, they won't melt the chassis, but will leave big black marks and maybe scratches. As for the rocket engines? I do not recommend it; bits aren't heavy enough for even a B size. Trust me on this, I tried it. The result? The rocket-car shot into the air, did six loops, and screeched between the gap of my house and the neighbour's house at 60mph, at least