Christian,
Why are you so set on the RS Turbo item? I seem to remember that these are actually smaller than the XR3i items, due to the fact that the RSTs have the original intercooler to the side of the radiator, whereas the XR3i ones are full size accross the front of the car?

Seeing as you have done away with the OE intercooler, is there not room to fit the bigger XR3i item with it's bigger size, won't it be more efficient as well?

I'm sure this is what Steven RW did on his car... .