So today a van that was driving in front of me dropped off the entire back half of it's exhaust. While I did my best to straddle it (couldn't go right or left of it..), it cut a hole in my Cobb downpipe.
My car now runs on the richer side of the spectrum, and I'm not entirely sure why. Is this because the second O2 sensor is responsible for injector input, and isn't getting a very good reading due to the hole in the downpipe? If I plug the hole, will it read accurately again?
Secondly, I'm going to heat it up with a torch, fix the crease, and weld it shut. Is there any reason I shouldn't weld it? It is stainless, and I've been welding for a few years, so I figure it couldn't hurt. Any objections? Thanks!