Wiring for o2 sensor on cat - help needed!

[EatSleepRace]

Ok, I have a 1997 Civic Ex, 1.6 liter Vtec...we installed my Spoon Header and were going to install my buddies high flow cat that he was using on his 95 Civic LX, but on the cat that he was using there is no port to screw the o2 sensor in... So, the only other option was to run the o2 sensor that should be in the cat to the second o2 sensor port that is located on the Spoon Header, but the wiring for that o2 sensor runs up inside the body of the car and as far as i could see would be a pain in the ass to get out... Anyone have a similar issue and have an easy solution, or at least tell me a half decent way to get the wiring out without effing it all up? Thanks!

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[hijuela]

if u have a welder ,weld a nut that the o2 fits in there and weld the nut right before the cat