Nice video

.I thought the same that you tforth.In some places the viper just cant keep up,an some times he is using the air cone.Well but that viper has some huge grip.
The porsche driver seems to be Sabine Schmitz.
Frikadelli Porsche 997 GT3
Basic Porsche 997 Supercup made of hot-dip galvanised steel with weight optimisation by carbon and kevlar
- aerodynamic optimised front spoiler with underboddy and diffuser made of carbon
- adjustable rear wing
- demountable steering wheel
- three-point air lifting system
- electrical fire-extinguishing system
- 120 litres safety tank with a rapid filling sysstem
- 1250 kg weight (due to regulations)
- six speed gearbox with sequential control
- infinitely variable Bilstein suspension
- tripartite central locking rim
- tyres: Yokohama Advan VA: 280/650 R18 HA: 330/710 R18
Engine
- 6 cylinder boxer engine with radiator
- max torque 500Nm
- max power 549hp at 8.200 rpm
- max rpm 8.900
- four valves technic
- dry sump lubrication
- cooling water rapid filling system / engine oil rapid fillingsystem
- MOTEC with data recording
Breakes
- braking system with balance adjuster
- BREMBO 6 piston aluminium caliper (front)
- BREMBO 4 piston aluminium caliper (rear)
- FERODO brake pads
- BOSCH ABS and traction control
I didn't find data for the viper.