Opening up the Porsche 911 Carrera S
![None](http://picolio.auto123.com/art-images/146836/Porsche-911-Carrera-S-2012_main.jpg?scaledown=1024)
The flat-six bolted to the rear of the Porsche 911 Carrera S is curiously clattery and unrefined when it first achieves ignition and settles into idle. Until there's some heat in the engine, it sounds delightfully messy - sort of like an old VW Bug with an exhaust leak.