Your average classic Porsche owner is a purist. But it must be tempting when someone builds a hybrid electric motor that sandwiches between the engine and transaxle, adding up to 150 horsepower and 150 lb-ft of instant torque to a range of Porsche engines, including air-cooled Porsche 911 models. The system is made by a company called Vonnen, and the product is suitably called Shadow Drive, as you would have to look carefully to see the unit once it’s in place. And, if you’re worried about weight, Vonnen knows its customers and has a full solution.
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