My truck has issues with exhaust manifold its under warrant with Dobbs we're waiting on a pert. Is it safe to drive my truck in the meanwhile?

What is your question?

It has been worked on with aftermarket equipment. Now I'm told it'll be about 3 weeks are so before the manufacturer sends the ordered part. The noise has gotten louder.

What makes this problem better or worse?

Yes

How long has your 2016 Ram 3500 had this problem?

A few weeks