Why cracked manifold not covered under defective policy , "poison gas leakage"?

What is your question?

I was told by a mechanic that Dodge 1500s have the same problem all the trucks with the manifolds cracking would this not be considered a defective issue! Should'nt it be covered underneath defective policy? Both sides of my truck the manifolds were cracked where's the passenger side when then the driver side went like a week 2 weeks later .This seems to be issue with all dodge's. I was informed that it does not have to do with any safety features where in fact it leaks exhaust /which is a poison into your vehicle. How can a poison being pumped into your cab where you're sitting with other people not be a safety issue this is something that you can put you to sleep while you're driving and or cause health issues.

What makes this problem better or worse?

The noise is worse when the engine is cold it's subsides a little bit when it warms up

How long has your 2009 Dodge Ram 1500 had this problem?

About a month