Why does my Audi A4's engine feel sluggish at high speeds?

I've noticed that my Audi A4 seems to be struggling to reach high speeds even though it is a high-performance car. At low speeds, it runs smoothly, but the engine seems to struggle when I try to accelerate on the highway. What could be causing this issue?

It is possible that your car's air filter needs to be replaced. A clogged air filter can impede airflow to the engine, causing it to struggle at higher speeds.

Another potential cause could be a faulty fuel pump. This can affect the amount of fuel reaching the engine, causing it to struggle at higher speeds. It's best to have this checked by a certified mechanic.