Air intake will help. fuel rail won't bother you til 700whp or something, probably more. Intake manifold will help a whole heap, some plastic spacer to keep the heat out of it and a better "neck" will help with breathing.
CF panels aren't really common so I dunno how much stronger they are over regular fibreglass stuff but like johl said, the fenders will crack if a car hits it and will disappear pretty quickly if the tire touches it. Metal you can beat to whatever shape you want, glass-y stuff is set unless you wanna mess around reshaping it either with heat or more glass on top. You can always repair glass as long as you have most of the bits after it shatters.