Even before they've hit the road, the Turbo and Turbo S versions of Porsche's all-electric Taycan are home runs. The company is already holding more than 20,000 orders for the pair, exceeding the first year's production originally planned for the brand-new factory in Zuffenhausen. And the 2021 Taycan 4S, a little less powerful but a lot more affordable, is only going to further amp up demand for Porsche's accomplished Tesla fighter.