http://www.lancerregister.com/showthread.php?t=322639
Looks like it was a conversion Xtreme were offering, whether they did 10 cars or limited it to 10 conversions I don't know!?
They have an evo x for sale on their site that looks like its had the same conversion so they may still offer it to people?
Has the seller offered you a price for it yet? Having had a look around you can get a lot of Evo for 15k