I see what your saying but theres a few reasons really. Insuring a converted 170 is much cheaper, i can get the donar car for a lot less than a functional rs, i like my car and i want to try something different. If i know it will fit then i will give it a bash but if its going to be an absolute nightmare and require loads of parts then i wont bother and keep saving for an rs haha. Im hoping because they are a focus it should be ok.