Maximum speed is mach 2 in a dive it could probably go faster. In any case numerous aircraft can go faster than listed top speed but damage the airframe doing so.
In Canada we had the CF-104 with composite intakes. Arriving at top speed the intakes where deforming giving more air to the engine and making the jet accelerate more, if the pilot let it go and pass top speed the Canadian CF-104 would swallow the deforming composite intake and destroy the engine....