Can anyone please explain to me why nobody has developed a cosworth motor for the focus rs ? I see cosworth do something with Subaru and Mitsubishi (jap crap) but not ford ??? Is there no call for it or something ?

Also can someone explain to me why WRC seem to only be using small cars in rallying now I.e polo's,fabia's,etc ?

I can only think why cosworth haven't developed these engines further is due to no demand or evolution I.e hybrid cars ???