I was changing the Exhaust Manifold on an '09 Chevy Malibu. When tightening the bolt with the new one on, I twisted the whole bolt and stud off. So I have a couple issues. The broken stud is now left on the back of my engine.
What should I do to fix this? Options considered: Remove the broken stud. If so how? Weld a nut, drill it out, etc. Leave it? There are 9 other bolts. Is that good enough to form a seal with 1 missing? Currently, it still leaks exhaust.
Another question here: Question2.