silver tape or even duct tape........ well, I'll be, there's the propper use for that stuff.. He He
But seriously, there's a lot of air leaking in those things.
I took an '89 Mercedes SEC that had the exact same set up, using the exact pieces.
Maybe even a ram air hood or a small, smooth hood scoop.
I know a shop in upstate NY that makes real carbon fiber hoods. let me see if i can find his web site....