How fast can a cafe racer go?

Excuse me, could you please elaborate on the speed capabilities of a cafe racer? Are we discussing a stock model or one that has been modified for higher performance? Additionally, is there a specific brand or make you're referring to, as some cafe racers may be designed with different engines and aerodynamics that can significantly impact their top speed? It would be helpful to understand these factors in order to accurately address the question of how fast a cafe racer can go.