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The top speed of the Toyota Supra Mk4, also known as the Toyota Supra A80, varies depending on the model and specifications. The stock or factory-rated top speed of the Supra Mk4 typically ranges around 155 mph (250 km/h) due to Japanese regulations at the time limiting top speeds to 180 km/h (112 mph). However, with modifications and tuning, especially in later models or those exported to other markets, the Supra Mk4 can achieve higher speeds, often exceeding 170 mph (275 km/h) or even more in some cases.