Racing Headers with High Flow Sport Cat

[golfguykgb]

Looking to solve CEL with codes of P1117 and P1118. I have a cold air intake, 986 Boxster Race Headers with no cats matched with the 986 Boxster Primary Sport Catalytic Converter. My oxygen sensor is plugged into the header where the three primaries merge into one pipe and the other is plugged into the bung just past the small sport cat on the rearmost section right before the muffler section, the middle bung has been plugged. I extended the rearmost oxygen sensor myself with two oxygen sensors on each side in order for it to plug in properly. I was wondering what I could buy or fix to removed the CEL codes I get every couple of months. Was wondering if anyone sells extension for the oxygen sensor wires or sells the longer version of an oxygen sensor for the rear sports cell cat. Thanks guys.