Of course these WRC and Group A cars are just a shadow what rally cars were 20 years ago when Audi Sport Quattro, Peugeot 205T-16 and Lancia Delta Integrale HF (and later S4) were flying low with 500-700hp under the hood.
Engines were capable of pushing over 700hp thought power like that was too much for rally and was used mostly after Group-B was banned and cars were used in RallyCross (kinda like Dirt-track).
"Henri Toivonen drove an S4 around Estoril, the Portuguese Grand Prix circuit, so quickly that he would have qualified sixth for the 1986 Portuguese (Formula 1) Grand Prix.
Nigel Mansell sampled a Peugeot 205 T16 and said it could out-accelerate his F1 car. And, perhaps most impressive (frightening?), the driver's reaction times were cut in half compared with previous rally cars. The Group B rally cars and their pilots were the stuff of which legends are made."