I put my badmab header back on and noticed the O2 sensor was all bent out of shape somehow. I replaced it with the proper ac delco part, but now I am getting this weird noise from that area/rear of the engine. Maybe its not related, but ive never heard this noise before. Im at 125,000 miles, so I suppose it could be worse.
Any of you recognize the noise? Sometimes it doesnt happen at all, sometimes it starts and then stops after a few minutes, other times it never stops.