I need help, my car rumbles when its on 2000 to 35000 rpm. It always happen on cruising speed. I'm pretty sure it's coming from the exhaust. The other day i looked under my car just to make sure nothing is loose, but everything seems fine to me.

My brother in law told me it's my EGR, exhaust gas and recirculation ( ithink that's what it is)

Did anybody had the same problem with their car? Does anyone know how to fix it? Does anyone know what i'm talking about?