not entirly sure tbh mate! i dont know what the rover inlets are like etc..

in my honest opinion, for what your wanting to do, everything thats std on a focus RS is avaliable reletevly cheap and easy to fit with no "alterations" to make,
simply bolt together and away you go,


heres a simple modd'ed focus RS and results

Full Mongoose inc de-cat
Adjustable actuator
Forge re-circ
K&N panel
AE base map with blufin


remember this car is still runing std exh manifold... and only 18 psi boost....