I own a 1998 Mitsubishi Eclipse GS and had a Full Magnaflow Cat-Back Exhaust installed about half a year ago. About a month after it got installed I began hearing a light rattling noise coming from (what seems to be) under the center of car, I did notice that the pipe is up against the frame while it was parked. What could this be? Also, there seems to be a bit of smoke coming from the Catalytic Converter after driving it really hard. Thanks.
Rattling noises can be coming from several places. You could have loose hangers, loose clamps or the cone in the cat could be breaking up causing a rattling sound.
If your pushing your car hard you could be over loading the cat and it may smoke or smell trying to burn off the extra unburned fuel. No pipe should be against the frame. It sounds as though you may have hit the exhaust system and bent it.
You will need to get it on a lift and get a real good look at it.
You should have brought it back where you got the cat installed the minute any noises started.
Try to bring it to a local repair shop were they have a lift and have them look at the entire exhaust system.
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