Brenda Priddy's spy photogs caught up with the 2010 Pagani Zonda F supercar prototype running through a testing regime in North America. Up front, this next-generation Zonda F will get an all-new front clip. In back, the rear quarter-panels have been re-sculpted to allow for significantly increased airflow. The rear diffuser has also been redesigned and there is a new air scoop that sticks up from the middle of the engine cover.

This Pagani has enormous 335/30/ZR20 Pirelli P Zero Rosso tires in back and 255/35/ZR19 tires in front. Inside the wheels are equally enormous carbon-ceramic brake rotors.

What powerplant this supercar might run is a mystery. Pagani covered the clear engine compartment panels with black tape, and judging from the new, larger air intakes on this prototype, whichever motor resides under the cover needs more airflow than the Mercedes-Benz AMG 7.3L V8 found in the current Zonda F.

There are rumors of the 5.4L supercharged V8 from the McLaren SLR 722 or perhaps the bi-turbo V12 from the recently-debuted Mercedes SL65 AMG Black Series providing motivation for the Zonda F. Whichever motor is selected, it should be good for 600–700 hp.

The Zonda F should start production sometime in the first half of 2009. Price: expected to be a cool $650,000.