I've got TSP headers with their catted Y pipe. No codes, all O2 sensors still in place. I needed 12 inch and another 24 inch minimum extension wires. The driver side downstream sensor is moved over quite a bit.
Do yourself a favor and get a couple of little studs to screw into the head, hang the exhaust gasket and get the headers started. Made it so much easier to install, for an old guy.