What
Ales sed.
The majority of the F40 bodywork is kevlar- only the cockpit tub and some odds and ends (oil cooler brackets, etc) are CF. The oil cooler pods (rear bumper) should be kevlar, and the section in between should be silver foil, for heat shielding. I'm using SMS kevlar for mine, and I haven't had so much fun since doing my taxes. Those louvers under the oil coolers are a blast!!
