Meh...

Not to undermine your point, but the current Swiss Champion uses a 610Hp/12.000rpm SLK with 780 Kgs ;)

Let´s one up with something even crazier.What about this Hillclimbing Lancer Evo III from Cyprus?

https://www.facebook.com/hillclimbmonsters/ I will just leave this link here for all those who really want to know everything about Hillclimbing. Prepare to be amazed ;)