PORSCHE 991 GT2 RS Exhaust 100 cell cat pipe setThe much anticipated 991 GT2RS, at 690hp, 750nm of torque, and a 0 60mph time of 2. 7 seconds, makes this incarnation of the revered GT2, the most powerful 911 ever built. The factory supplied titanium exhaust, despite sounding better than the previous 997 generation, still does not reflect the raw nature of this supercar, however, here at Kline, we are experts in turning lacklustre turbo sounds, into exotic supercar howl!