Techart Adds 660 HP GTstreetR To Porsche 911 Tuner Stable

Tuner Techart, apparently inspired by Porsche's endless 911 iteration game, has released its GTstreetR version of the 911 Turbo. The new model slots between the company's 630 HP GTstreet » 10/29/08 4:20pm 10/29/08 4:20pm and 700 HP , producing...you guessed it: 660 HP. The mods read like a laundry list of Teutonic speed parts, including new twin…