I'm pretty sure it is just your exhaust system starting to 'tic' as it cools. I could be wrong as I have a manual, but both my Z and Automatic Juke tic themselves cool after driving. Especially if you've gotten on it right before shutting off.
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2017 Ford Focus RS Nitrous Blue "KB43VER"
2014 370z Mag Blk 6M "KOKURYU" (Black Dragon)
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