Have been thinking of doing this for a while now, and after seeing Frayz's last week thought i'd do it.
Basically it is a rear spoiler for a E46 3 series BMW fitted to the rear edge of the STI spoiler.
A few guys from the States have fitted these and swear by them.... only seen one on a UK car (Frayz)
Jury is still out. Looks good on a black car, not sure if it suits a silver one or not.
If it's good enough for a RS500 is's good enough for me!
If i decide i don't like it then it'll come off easily enough.