SRT VIPER 2015 GRAND TOURING. Stryker green. Detroit Motor Show 2014. From a selection of top American cars presented at Detroit 2014. SRTVIPER GRAND TOURING 8.4 litre V10 produces 640 bhp allowing for 0-60 mph in less than 4.0 sec & claimed top speed of 205 mph.2 Mode Bulstein(regt ™) Damp Tronic select suspension. The new GT model benefits from five-mode stability control system, electrically adjustable suspension and upgraded interior trim.