Wouldn't even need to change the tune to get it registered its only intake piping and exhaust they don't need to go on a hot lap in the car they should only be checking for bald tyres, oil leaks, worn bushes and balljoints it's not that hard I've done a few cars now and I just leave little thing wrong with the car like slight oil leak then they pick it first time fix the little bits and it will pass it's it really easy I don't know why everyone makes such a fuss about it.
If you really want to engineer it and emissions Justin at BYE Performance seems to have no problems getting a car to pass an emissions test first time.