I really wouldnt bother, If you want more power sell the 1.6 and get some of your money back. Then go and buy a FRS.

I did the same with a Sierra 2.0i Ghia and did a full cosworth conversion, spent thousands on it. And when you come to sell it you never get any of the money back.

So much would have to be changed on your Focus, Arches, Engine, Gearbox, Brakes, Ecu the list is endless. Really not worth it IMHO.

Trust me i've been down that road, would not recomend it to anyone.

Regards

Paul