make your own close ratio box from a 1600 xr2i box and a 1800 rs zetec box
step one use the gear set from the rs 1800 onto the xr2i shaft fit the xr2i 4.06 crown wheel onto a quaife atb diff then fit the 5th gear from the xr2i to top it off this gives you a very tight close ratio 1st 2nd 3 rd 4th and a 5th that will take you past 134 on 13 inc wheels they used lower gears in the rs box to get it to go as quick as the cvh use the rs 1800 box as it has the better bearings (eg bigger)