i still dont get this obsession with telling everyone to search. it takes just as much effort to type the answer as it does to say use the search. If everyone searched for stuff then there will be no new posts! It also doesnt look very friendly to new members.
as for a cento turbo.
No, they never made them straight from the factory. the only models they did were the 899cc S and SX and the 1108cc sporting.
The turbos have been proffesonaly converted either by Van Aaken or sometimes Novitec or possibly another company or custom.
kits usualy come in around £1000 + more if you want it fitted. either buy the kit and get it fitted or fit yourself OR buy one thats already been turboed. Sam or Firewarrior on here is selling his high boost cinq sporting. throw him a PM if your interested