Why does the Audi A4 have dual exhaust pipes?

I notice that some Audi A4 models have dual exhaust pipes while others have a single exhaust pipe. Why is this and what difference does it make?

The dual exhaust pipes on some Audi A4 models are a design choice and do not necessarily affect the performance of the vehicle. However, they can improve the sound and appearance of the car.

The number of exhaust pipes on an Audi A4 depends on the engine size and power output. Higher-performance models often have dual exhaust pipes for improved exhaust flow and engine performance.

Having dual exhaust pipes on an Audi A4 is also a way for the manufacturer to differentiate between different trim levels and packages. It adds a more sporty and upscale look to the car.