lol im just trying to find some kind of level thats fair to compare the 2 as if you look at things like this :

fully moded cosworth - been proven over 1000bhp yet the focus hasnt had the 25 years that the sierra has had to reach that yet, so obviously the highest spec focus vs highest spec sierra cosworth = cosworth wins but its unfair

standard forms - focus rs has a standard 80+ odd bhp more but from what i see not alot of potential for alot more atm with it being new, whereas the sierra does - so another unfair way of looking at it

btcc cars - the rules are different to what they were back then and you got away with alot more back then and im prety sure the btcc spec sierra rs500 would be all over the focus btcc car of today - so another unfair challenge to compare them by

only way i see its fair is to give them an even +bhp level and see how the running gear handles with it round a track, fair comparison on engine power and running gear with old technology against new surely?