The Boxster and Cayman have flat 6 engines mounted lower in the chassis. The exhaust system is set fairly well back from the engine and shielded by the floor pan and the bulkhead that separates the engine bay from the boot/trunk area. They have lower rev limits so thermal build up is reduced and the cooling system required for these smaller engines is also less complex with fewer radiators requiring a much lower surface area. Porsche also package these models differently with the fuel tanks up front etc which allows slightly greater space around the engine for airflow. The fact that the cylinders of the boxer engine are effectively at the bottom of the engine gives them greater airflow around the areas of heat build up simply from the air passing beneath the car which allows allows excess heat to be drawn away.
With a mid mounted V8 or V10 the cylinder heard are midway up the body of the car and out of any natural wind flow areas so require more forced cooling. The rev limits and operating temperatures are much higher. The biggest issue on these cars is packaging all of the required radiators for cooling the engine and gearbox. It's one of the reason why the Veyron cost so much to develop as the cooling challenges on that car were immense and in the end the engine still had to be left exposed for additional cooling. Porsche did the same with the Carrera GT..
Reginos,
I've owned an Audi R8 and can assure you they get very hot. Audi did have an issue on the early cars.
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