I just installed headers on my car. That whole pipe was damn near falling apart, and a mechanic confirmed that I have an exhaust leak. So, I fixed that problem. I installed it and took it for a 2 mile test run. First impressions; I definitely did not lose any low end torque. The car doesn't sound much different, which is fine. I am definitely feeling a slight increase of power, particularly above 2500rpm.
The header relocated the oxygen sensor to be more underneath the car, so I had to remove the O2 sensor to get it all to fit, since the original sensor wire was probably 16" too short. I plan to cut and lengthen the wire and re install it tomorrow.
Am I doing any damage to any components by not having the oxygen sensor up and running for a day? I'll drive 21 miles tomorrow without it. If it's serious and critical that I have it running, I can get up early and install it before work. But if it's not going to cause any issues for such a short trip, I'd rather just do it after work.