my old mk5 rst ran fine with a intake cossy pump, but i was running efi, not sure if that make's any difference?
im sure if there are any problem's it'l show up on a rolling road anyway, just make them aware of a fueling problem and im sure they'll be able to sort it
failing that, join upto escortevolution.co.uk and im sure someone on there might be able to help abit more...