Fuel Rail Covers, FRC's, for mod short lists, might look silly to some, ugly to others, but I'd rather have them than not.
my '02 SS Camaro did not have them, and they were expensive and had to be cut in several places to get them to fit.
all those wires and the coil packs are exposed to elements without them.
If you all like keeping your engine area clean this will keep water, soap, grease off the coils for the most part.
I think the engine compartment looks much better and I've had one car without and now with.