The GT Street R is fitted with a power upgrade kit, which boosts engine output to 660hp (485kW) and 634lb-ft (860Nm) of torque. These sees acceleration figures for the automatic 911 Turbo whittled down to just 3.4 seconds for the 0-100km/h sprint. The manual model takes just one tenth of a second more, and both models will reach a claimed top speed of 345km/h.
http://www.motorauthority.com/blog/1030477_techart-releases-new-gt-street-r-package-for-the-porsche-911-turbo

ターボ用のキットみたいね。

TechArt GT Street R Porsche


a TECHART tuned Porsche 911 (997) Turbo at Nardo test track in Italy and Southern German roads

GRIP - TechArt GT Street R Porsche
http://www.youtube.com/watch?v=oQlO9WBgpWE
TECHART tuned Porsche 997 Turbo at Nardo
http://www.youtube.com/watch?v=pR8gHvPN1Gs