two comments:
1: Back to the original post, the light came on due to a low tire pressure, so did you inflate it and is it now holding pressure? Might be no big deal. The kit that comes with the car works OK for inflation, but it's not very heavy duty. Mine already died after using it a lot at some autocrosses.
2: The photo of the big ol' muffler-looking thing reminds me that the first 2012 Abarths in the US also had that. On another Fiat board they refer to it as a "suitcase", since it's not really a muffler, just an empty chunk of metal with a scorpion on it that weighs about 17 pounds. If nothing else, the 2013 and newer Abarths don't have the "suitcase", so weigh a few pounds less than the 2012s.