Recently Austrian police tested a Porsche 911 modified with a police package. The test car is considered a major success (not a good idea to try and outrun this thing), and the police plan to purchase more Porsche patrol cars.
The Porsche 911 police patrol cars have a top speed of 177 mph (about 285 km/hr). The biggest problem with the Porsche is lack of space. Radios, a breathalyser, and of course a radar make the driver's position somewhat cramped.
Radar Detectors are illegal in some parts of Australia. Some police use Radar Detector Detectors (RDD's) to enforce the law where radar detectors are illegal. Installing an RDD into an already cramped Porsche makes a tight situation tighter.
CopRadar