Quote from Gutholz :

Not sure about rallycross series, but I think in WRC etc they have to use the same suspension system as the production cars. So MacPherson in most cases. The rules allow to change the geometry (different springs, lenght of arms etc) but the general system must stay the same.

In RX it has varied!

GCK-megane was Double wishbone and inboard suspension, McPherson was also used by most with traditional suspension.

So we took the system that fitted the driving most. And it has been so far really succesful