Chheers Mark,
hillclimber,burp is right,because of the costs and Hungary was quite a poor country in relative terms,Reault did a deal and supplied 40(I think)172cups and they were converted by Zengo Motorsport under Renaults instructions to a speck that suited all concerened,and then all sealed and cup car plated,it turned out to be the most popular and most watched class at every venue.The plus side is its very cheap to do a years racing compared to this country£15k is better than£60k!!!