2010 Pagani Zonda F [Spied again]

The global economy may be on the outs but Pagani is moving forward with the development of an all-new Zonda F -- the first major update in the car's 10-year history. Spy photographers spotted Pagani's latest supercar undergoing a series of tests in North America, with the new Zonda F inching towards production ready.

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 totally new air scoop that sticks up from the middle of the engine cover.

Inside the previously spied prototype, we can see the "Zonda F" nameplate above several toggle switches. Other than a new shifter, we don't see any major interior changes.

This Pagani has absolutely 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 be packing is a bit of a mystery. Pagani certainly wants to keep the motor a secret as the clear engine compartment panels were covered with black tape. Judging from the new, larger air intakes on this prototype, whichever motor resides under the cover obviously needs more airflow than the Mercedes 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. Whatever the motor - which will be sourced from AMG -- it should be good for 600-700hp.

The new car is being designed for the U.S. and Japan and should be ready for launch sometime in 2009. Although pricing is far from official, expect an MSRP of at least $650,000. Because of high demand, Pagani will also boost production to 60 cars a year, up from its current annual production of 16 units.