2014 screw 4x4 ecoboost
Wondering what I would look for if my headers are warped. I’m smelling some exhaust I believe (mother says it smells rich). Do I have to pull some stuff out to check, do I use a feeler gauge? I just need to know what I need to know to check cause they are originals from 2014. And need to know (if they are warped) would it be something super involved or moderately easy to where I can do it in my garage.