I've taken my off quite a few times. I can't decide if I like it better with or without. To fill in the holes on the trunk lid, I bought some little nylon plugs from the local hardware store. They are pretty flat when in the hole, so you can hardly see them. I've driven it in some pretty hard rain too and didn't have any leaking, but since there is nothing there to actually seal, I wouldn't leave anything in the trunk that shouldn't be getting wet.
"to0slowcobra" If you're thinking of removing your wing to fill in the holes,just purchase a seperate decklid and have it painted Mystic unless your orig.trunk already has paint flaws.
I'm gonna have a wingless trunk painted to replace the orig. one on my 04 Mystichrome Snake!