Prj wires use actual Taylor wire. As for my input on zzp's wires, first time I pulled the wires off when I installed my headers the terminal ends came out of the wire and stayed on the plug on cylinders 1-3. Then when my replacement wires got here I put them on and I now have misfires at wot. I'm done with zzp's wires, I'm going back to either Delphi/acdelco wires or MSD if I can get a deal on it.