[ERA 778]

I didn't undercoat the aluminum panels in my ERA because I like the looks of the bare aluminum. At very low speeds I can sometimes hear gravel tossed by the tires, but it always sounds like it is hitting the fiberglass, not the aluminum. At higher speeds you can't hear anything but the gorgeous sounds from the engine! The coremat protects the fiberglass as someone already said, so if you like the look, leave it!