I could be wrong but I thought that you could only fit the Bailey dv26 to a focus rs!
The hose that goes onto the top of the dump valve is the same one as goes onto the top of the OE recirc dump valve. Just take off the OE valve and blank that off and attach the hose from the top onto your dump valve. I think that is right from memory!
If you get it to work you will find that the car runs rich for 200-300 miles whilst the ecu sorts itself out. After that it settles down (well mine did!).
Good luck