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i have a full exhaust for like 3 years on the car, but just recently the exhaust towards the back of the car, it rattle mostly at idle and sometimes hear it driving. its not that loud but, if you have the windows open, next to a car or whatever you can hear it. it is coming somewhere from the middle of the exhaust to the back of the car, it sounds like if you were scraping on a speed bump. if you hold the exhaust it stops, so it has to be hitting against something, anyone have any ideas please?