My exhaust is loud on 2002 Lincoln Navigator

When I drive the exhaust is very loud and when it's idle it's loud also, I was wondering how much does it cost to fix the problem? Also my six cylinder needs to be fixed too how much would that cost to fix it?

Asked by for the 2002 Lincoln Navigator
exhaust can cost up to around $1000.00 depending on parts you choose. can't say about 6 cylinder. mechanic won't know prob. until he opens it up. get diagnostic run on engine to narrow down prob. if it's not firing may just spark plug or ignition coil.
Thank you so much I appreciate you responding to my question