I don't think the rear wing of an Evo X gives (much) more downforce than one of an R5 car. I think the stability will be different. Due to long wheelbase a group N car will be less nervous in these extremely fast turns, it probably gives more confidence. Also acceleration on high speed (like from 150kph to 180kph) is maybe better with Gr.N cars? > Someone who knows more about this can tell us more I think?