[quote=“JeffN” post=69798]As I’m the one who brought this up, I figured I’d chime in. I was exploring my options for a replacement bumper to keep around for a back up and thought a fiberglass one could do the trick. I like the idea that I wouldn’t have to spend $200 on brake ducts and just use the bumper’s built-in ducts instead.
Let’s assume that the spoiler doesn’t extend past the profile of the bumper. The flat bottom is the questionable part I suppose, but it’s mostly there just to keep the bumper from flopping around in the wind.[/quote]
Fiberglass would be a really bad idea. even if legal, it won’t survive much bumper-to-bumper contact, which is very routine. also, what you have there is a lightweight cover, without the core or solid attachment points of the OEM bumper. it’s far from a plug-play installation. PS, I don’t think replacing the factory bumper with a FG cover would be legal.