was reading your thread and responses on the other corvette forum. Are you now looking for reassurance here?:huh: The art of customizing one's vehicle is to make a personal statement. If you want to do it, go and do! Don't worry what others will think.
it's actually an awesome gas cap. I've seen them on a couple C3 cars but never on a C4. Apparently buying the gas cap is not all you need. You have to get a piece of aluminum stock machined into an adapter/flange in order to attach it to your gas tank. (it won't be covered by the gas door) Here's a link from a guy on the forum I saw a while back. He has the plans you would need to bring to the machine shop all laid out here (relevant to C3 only):
I have seen something similar for Mazda Miata. I had one on a 1999 I used to own. Made that car look more like a classic Jag. The pictures I have seen of this piece just looks stuck on and out of place on the C4. As I recall the piece was heavy too. Better off adding the bling with chrome exhaust tips or on the wheels.