The 2017 Abarth 124 Spider has inaccurate engine noise. For a start the turbo is too loud (you shouldn’t be able to hear it) and secondly the exhaust should sound more agressive. There is also an optional exhaust is called the ABARTH RECORD MONZA EXHAUST which gives the car the more agressive sound. This should be included as either an optional upgrade or as standard.
The following link includes the official information about the car
This car review also demonstrates the exhaust