The 911 Carrera 4 has the same 345-horsepower flat-six engine as the regular Carrera but benefits from the addition of Porsche's intelligent all-wheel drive.

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For the 2009 model year and beyond, an all-new version AWD system was introduced. The system features electronic control of the differentials instead of the old viscous multi-plate clutch. It is a modified version of the system developed for the more powerful 911 Turbo, and features a mechanical limited-slip rear differential as standard equipment.

This system transfers at least five percent of torque to the front wheels at all times and, under low-grip conditions, can transfer up to 40 percent. So the 911 remains a nimble, predominantly rear-drive sports car but with the bonus traction of four driven wheels.

In normal driving conditions, only the rear wheels are given power. However, in low-grip conditions, five to 40 percent of power can be seamlessly transferred to the front axle. The driver may not even know it's happening. The stability offers peace of mind as well as more confidence for spirited driving of this sporting machine.

A side benefit, Porsche Stability Management with traction control comes standard and helps to reduce stopping distances. PSM works in conjunction with the Carrera 4's variable differential.

The standard transmission is a close-ratio six-speed manual, with a PDK seven-speed automatic optional. The PDK has steering wheel-mounted controls for when the driver is in a shift-it-yourself mood.

All C4 models can be distinguished from standard 911s thanks to wider rear fenders (by about 1.75 inches), a red reflector joining the rear LED brake lights, and LED daytime running lights up front as well as standard bi-xenon headlights.

In the cockpit, a new Porsche Communication Management system will be standard and support Bluetooth, USB devices and iPods, as well as offer easier interface with its touchscreen interface.

Ceramic composite brakes are optional and work great for high-performance braking situations. Other options include parking-assist sensors, self-dimming rearview mirrors, aluminum-look interior trim, a navigation system, high-end Bose audio system and six-disc CD changer.

On the 911's tail is a hidden spoiler that pops up when necessary to apply down force on the rear at high speeds and keep the car firmly planted on the road.