Porsche marks the 30th anniversary of the famed Goodwood Festival of Speed in style with the Porsche Vision 357 Speedster. The new concept car is the sister-model to the closed Porsche Vision 357 with which the sports car manufacturer launched its own anniversary-year celebrations. In design terms an homage to the 356, technologically the all-electric Porsche Vision 357 Speedster is based on the 718 GT4 e-Performance. Overall, Porsche presented more than 15 new and classic models on the g.