I like it! Personally I would put it on for a while and see if it grows on me or drives any different. I'm a Porsche guy so I'm partial to the whale tails though.
Where did friend get it/ where could I get one of these? I was originally looking at the ZCC spoilers for my 260 but I like the looks of yours. I think it might go even better with a wide body rear.
Other whale tails:
From this thread:
And a zx on this thread: