I think chavs are sometimes being mixed up with being teenage lads. Its very different. First cars, high insurance, first steps in moddin is easy access to Halfords. I've seen many a first car on here before buying a clio, and some look pretty chavvy to me!!!!
Chav's is not just a money thing, its more through your postcode, your peers and values I think.
The irony is I don't think chavvy people would buy the Clio 197 because they don't want to seen as 'stuck up' or middle classed!!! The reasons why they wouldn't want their kids going to certain schools or drink in certain pubs. The whole thing kind of works both ways.