Sierra Cosworth RS500?
:
Having had the pleasure of being punted around an areodrome in one just after I passed my driving test (part of an advanced course - pressie from the folks) I will not have a bad word said about them.
The wing served a purpose and wasn't just for looks (although remember kids, this was 1987 and everybody loved wings back then). I would gladly have one parked in my driveway, unmodified and perfect. But in black.
PS - this pic of a normal Cossie, not the RS500. My bad. Small prize for the first person to tell me, from this angle and without looking at badges, what the difference is between them... visually, at least.