Here's a spy video of the next-generation 2012 Porsche 911.

We've already seen a lot of this upcoming new 911 (998 generation) but the closer we look the more those details we know of make their presence know.

The next 911 will change substantially in its dimensions. It will be longer by 56 mm over the current 997, with a total length of 4.49 meters. The wheelbase has also been stretched by 10 mm and it is shorter by 11 mm, shifting it slightly more towards a supercar shape rather than a mere sports model.

The width will remain the same, although, the next Carrera edition will have a wider rear body by 60 mm.

The rear axle for the next 911 has been completely reworked, engines too have been revised and the car will weight about 20 kg less than its predecessor.

The base model 911 gets a 3.4 liter Boxer engine with an output of 350 PS (257 kW / 345 bhp). The 0 to 100 km/h sprint time will take 4.8 seconds and the car will have a top speed of 289 km/h (180 mph).

The Carrera S gets a revised 3.8 liter with 400 PS (294 kW / 395 bhp) and 0 to 100 km/h sprint time of 4.5 seconds. Top speed will be 302 km/h (188 mph).

The 2012 Porsche 911 is set to debut at the Frankfurt motor show in September.

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