FRP vs Carbon Fiber hoods, what's the difference?

The main differences between FRP (Fiberglass Reinforced Plastic) and carbon fiber hoods are:

Weight

Carbon fiber is lighter than fiberglass, but the difference is often negligible—about 3-4 lbs for a 25 lb hood. Many "carbon fiber" hoods are reinforced with a FRP backside and skeleton, the carbon layer is on the surface, so there is not a huge weight savings over FRP. Dry carbon is lighter but much more expensive.

Cost

Carbon fiber hoods are pricier, often $250+ more. The additional cost is mostly for appearance. Painting FRP hoods adds costs, making the price gap smaller.

Durability

Both are composite parts and can be damaged, but FRP is easier to repair.  Carbon can also be repaired in most cases but it can be harder if your bodyshop does not have experience.

Painting

Both can be painted, some people like to mask and paint only part of a carbon fiber hood and leave some carbon exposed. FRP is easier to modify and repair.

Functionality

Ramair or reverse hood scoops with pass through vents can be functional depending on the design (not all hoods are like this).  Always use hood pins or AeroCatch latches to make sure it is well secured even if it has a latch.

Conclusion: Carbon fiber offers slight weight savings and a unique look, but FRP is easier to repair and paint, making it a better value for street use unless you prefer the carbon fiber aesthetic.