Just too add, my insurance is due on the 18 oct at a renewal of £325. I asked my insurance what the extra would be with an aftermarket zorst, they refused to insure me...WTF
Did the price comparisson sites with and with out zorst as a modification, Prices were actually double with the aftermarket zorst. So in effect, i was paying for the zorst twice. It ranged from £790 to £1500 with aftermarket, and ranged from £325 to £900 with out.
So i will get one fitted, and keep my old zorst "just in case"