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Found it!
Scroll down to the yellow 182. ;)
(2nd page has better pics!)
http://www.cliosport.net/forum/showthread.php?t=377286&highlight=wide+rear+arches
There was a Clio sport in a scrappy on a French forum that had rear flared arches, IIRC it was the prototype for the Megane chassis/engine.
There's a pic somewhere on this forum, I'll try and find it!