This video features a Porsche 997 Turbo which has been heavily modified with a full Gemballa Avalanche GTR 700 R kit. Apart from the obvious exterior upgrades, the engine was upgraded as well.
It now produces 700HP. You can also see another Gemballa in this video, this one is fitted with the Avalanche GTR 650 R kit. They filmed some loud accelerations of these cars during summer holiday in Monaco.