I didn't have to cut any zip tie when unplugging the 02 sensor. I just pushed out the little plastic pin that had a zip tie built into it and when I was done I plugged it back in again. I think it was right next to one of the dp bolts. I'm fine with keeping the spt shifter, can't imagine the material would make any difference, thanks to xluben's pictures/measurements he took I didn't buy the kartboy. Thanks xluben, saved me some money!