got a 97 civic ex, and i dont know for some reason the exhaust and downpipe shakes. the whole pipe start to rattle like crazy when i start the engine after sitting for a while. also, if its just sitting on idle, the rattling and shaking comes and go.. any idea why this is happening, and any help on what i should do?

 

Check your exhaust hangers, one of the rubber hangers might be broken, or it came off.