2014 Chevy Equinox Exhaust Smell in Cabin

[chevyguy]

My 2014 has an exhaust smell in the cabin which is more noticeable when idling. I read online that the exhaust manifolds crack. Well today I’m getting into this and it’s a bitch. The secondary air injection is in the way on this model to access the exhaust manifold heat shield. 

Finally got the heat shield of and can see a crack...

Now trying to remove and replace it. Got the O2 sensor out and it’s in bad shape!

 

[chevyguy]

Replaced this with a Dorman exhaust manifold. Three years later, exhaust smell again. Walker catalytic converter flange to manifold weld broke. Replaced the pipe.