Akrapovič Titanium Slip-On Exhaust System 2014-2015 Porsche Turbo/Turbo S (991)Slip On Line Titanium Exhaust System The Akrapovi Slip On Line for the Porsche 911 Turbo Turbo S is the first stage in the exhaust tuning process and gives this already outstanding car a step up in performance. Made from a high grade titanium alloy and finished with exquisitely handcrafted carbon fiber and titanium tailpipes, the Slip On Line reduces weight to aid with handling. Akrapovis sound engineers have also created a deep and unique sound to