i have power steering on my mk4 and it was a huge job.
its sweet tho and i love driving it.
mk5 racks are no good as they are way too wide and are the wrong type of fitment.
my rack is a nissan bluebird rack.
its totally custom though.
custom p/s pipes at £30 a go.
track rods modified to have escort rods added to them.
chassis modified.
steering columb modified alot.
clutch pedal modified to clear.
its a big job and to be honest dont bother with the mk3/4 unless you can find a chairman, but i think even them have modded chassis.
my opinion is sell it and buy a fiesta rs1800 with power steering already fitted