The wheel-base of Subaru Impreza S5 WRC is maybe 3 to 4cm longer than actual 1.6T WRC cars... ;) The car has more "overhang", in total it's maybe something like 30-40cm longer than the "very very tiny" current WRC cars. Fact is that the cars on car market are growing all the time, and compared to the average car on the market, a current WRC car is smaller than 15 years ago indeed...