Hey guys i just got done putting my o/r h pipe in and it sounds awsome!, but i ran into a little trouble. One of the bolts got stuck up near the headers so i had to take it to a mechanic that i know so he could get it off and while i was driving there one of my oxygen sensors was left hangin down and it came off but i still have three left so would i have to buy another one or does it really matter? Because if it doesn't i'm thinkin bout welding the hole up to seal my exhaust. Also my check engine light came on so i'm guessing i'll need to buy mil eliminators, so where's the best deal on them and how do you hook em up?