How can I improve the aerodynamics of my Audi A4?

I am looking to improve the performance and efficiency of my Audi A4, and I've heard that improving the aerodynamics can make a big difference. What are some ways I can make my Audi more aerodynamic?

First, you can start by replacing your stock side mirrors with aerodynamic ones. You can also consider adding a spoiler to the back of your car. Additionally, make sure to keep your car clean and waxed, as dirt and debris can create drag. And finally, avoid adding any unnecessary accessories to your car, as these can also impact aerodynamics.