Porsche has added a high-performance, no-nonsense version of its mid-engine Cayman to its lineup. The new Cayman R is 55 kilograms lighter than the next most powerful Cayman, and squeezes 8 kilowatts more power out of the engine.The result is a pure-bred 243 kilowatt sports car that dispenses with cushy seats and a radio. Prices in Germany start at about 70,000 euros.