I have no amazing background: I owned (and crashed) a Citroën AX, had my first 309 (still my daily driver), second 309 (parts car stripped to the bare shell) and finally my third 309 the mighty GTI16. At my job I'm at most involved with designing semitrailers so nothing car related.
As for my knowledge it's way easyer when you're a native speaker, you can find more about the 405 Le Mans here:
http://www.auto-pub.net/ASL/Peugeot/page_Peugeot_406_Le_Mans_CH.htm
http://www.auto-pub.net/ASL/Peugeot/page_Peugeot_406_Le_Mans.htm