55 plate 172 - how come?

[maz172cup]

http://cgi.ebay.co.uk/RENAULT-CLIO-...3286.c0.m14&_trkparms=66:4|65:1|39:1|240:1318


not sure wat the story is behind is car, its a 55 plate but still a 172.
Is this normal or are we missing something:S

 

[5parky]

Thread already about it

http://www.cliosport.net/forum/showthread.php?t=388412