I actually know the guy selling this and he say:
Spacing the rack 5mm and a smaller steering coupler solves the problem. Thomas as Zurawski Motorsport has fitted a few and the quote for fitting was from him. Anyone wanting it fitted, speak to him. 07597 722472 Is his work mobile.
Tempted myself .............
O really, so is that fitting price including this rack spacing etc? Sounds very reasonable..
Remember that was for fitting and I think he said a base map - you will still need dyno time to map it in so add a few hundred for that