the exhaust system of course pings when shut off but when driving it also crackles. I can tell when i pull through a drive through like mcdonalds and i can hear the sound bouncing off the walls. When i drive the wind causes the system to move and it makes the same sound. VERY VERY LOUD!!! i tried to get te dealer to fix it but they said that chrysler doesn't approve of it and i have heard of people getting theirs fixed. how do i get it done?