There are several offers of Chinese cloned Lexia kits on ebay.   Some appear to be better than others - even reports of some not working on C5 cars.   Although I have no first hand experience of the company, this one always gets good reports.   As an owner of a C5-X7 you should take a look at this topic.   If you have recently purchased from a dealer, I would make it a priority to check the steering rack for fluid leaks.   Several members of models dating from 2008 through to 2009 have reported having leaking racks.