this might be a little lengthy but please bear with me.
so about 3 weeks ago i installed a RS R exhaust on my 04 accord coupe I4. there are 3 welded bolts after the Cat. they were hard to take off when i was removing the stock exhaust. so i did it and intalled the new exhaust. the top nut was hard to screw on the welded bolt cuz there was no room at all. so i installed it and went on a test run on the freeway. i noticed the power gain. after the run smoke was coming from the cat, or around that area. i looked and i guess the nuts werent tight enough so it could of been the exhaust fumes escaping or it could of been the gasket that came with the exhaust that might of been burning, i dont know. so i tightened them more. i still kept noticing a mild burn smell. that smell is completely gone now but everytime i use my car and i turn it off, there is a constant clicking noise coming from the cat, or around that area. it clicks really fast and as the car is cooling the clicking goes less and less. this happens everytime i turn off my car. my question is, does anyone know why this clicking sound is happening? thank you