Rattle in exhaust

While I was letting my car warm up this morning I noticed a rattle noise coming from around the muffler area. Now my car had sat out all night in one of the coldest nights so far (40s). After I drove it around and got to work it seemed to have gone away so I am figuring that it being cold was the reason for the weird noise. My exhaust mods are just flows and a prochamber. Just wondering if anyone else experienced weird noises from a cold exhaust or should I get it checked out.
 
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rattle

At 2,200-2,600 Rpm's you might hear a light rattle, it only gets worse. But if its spurratic,I'd wait and see if its due to the weather change. If you have a muffler shop that you use regularly, they'll be able to tell you in about 2 seconds w/out charging you.