I've got 2WD Cos setup front and rear on mine and it made a lot of difference, might have been cos I binned the ABS at the same time though.

I had to use a 5mm spacer on my 17s on the front to get the wheels over the calipers, but strangely I borrowed my brothers Zetec-S rims and they went straight on with no hassle...

If you do the 2WD setup give Ryan a shout as he got mine machined for me, they fitted straight on with no washers