Why does the rear exhaust of the Audi A1 S-Line sound louder than the regular model?

I've noticed that the S-Line version of the Audi A1 has a much louder and more aggressive-sounding exhaust at the rear compared to the regular model. Is this a result of a different exhaust system or other factors?

The Audi A1 S-Line is equipped with a unique exhaust system that is optimized for performance and features a sportier sound profile. The exhaust note is achieved through a combination of design elements and sound tuning during the manufacturing process. This means you can enjoy a more dynamic driving experience while still being street legal and compliant with noise regulations.