Lol at this thread, Cupsport is on a friend making mission.
I read somewhere the 172 cup has magic blue paint which makes them faster. When building the cars the french engineers were mesmerised by this paint to the point of distraction, which is why some cups appear less well built/ rattle more.
Cheap track toy/ purposeful b-road car, a 172 cup. More to spend and after something a bit newer, a 182 trophy. Want more or less the same but with lots of goodies inside to play with and a choice of pretty colours, at the expense of a little weight (in terms of speed you wont notice a difference on the road though), a 182 ff.