ive fitted a focus rs engine and box to my 2.0 esp and it went straight in and i used my original engine&gearbox mounts! make sure you get all the loom as i had to blend my interior loom to the rs one.
the driveshafts are also different and i had to moddify mine to get them to fit
apart from that its alot easyer than turboin yours....

i will admit it was the best thing ive ever done and now its pushing out nearly 300bhp but still looks like a 3dr 2.0 esp its caught alot of people out!!