The Fiesta doesn't really weigh anything. Mate of mine runs a 2.1 Zetec turbo with over 300bhp and this stopping set up is fine and hauls him to a haly quick enough. I personally think it's overkil and more grief than it's worth. Don't have discs on the back of my S2 for the same reason. Not saying that I am right and everybody else is wrong it's just my opinion.

I think you need a couple of spacer to fit the callipers but I can't remember as it's been ages sinde we done my brothers