what BHP are the 2wd coolers suitable to? and what are the 4wd ones capable of?

the 2wd seem to be alot cheaper than the 4wd ones so would this be a better option for the fiesta as they also seem smaller as well! thinking a max of 250 bhp for my car (if i do get cossie management in near future!

would the cost of modding them the same?

Also finally if you have one on a fiesta or escort, who did you have to mod them to fit and any pics of the pipework needed to fit them?