Sorry never heard of any brand called Proforma ??? I think u r mentioning about Protoform instead .. Yes, both Stratus and M6 is the most popular racing body nowadays.. got pretty good downforce and aerodynamics .. and furthermore its price is ... reasonable, only around $80 to 100 .. depends on ur relationship with the shopper ..
Then, what are the major differences between Nemesis, G6, Stratus and Mazda 6? I mean for the track design. I know some shells are good for straight road... but not sure which shell is for which track type.