Noise in a new car that Nissan can't fix

what to do when the manufacturer can’t fix a noise in the front exhaust tube…they say there is no upgraded part.

Is it under warranty? When you say manufacturer do you mean dealer? They are not the same.

I suspect there is a story here and we don’t know it.

Lemon law: //www.jdpower.com/cc/auto/bbb/lemon_law.jsp