Akrapovic Exhaust System for Porsche 911 Carrera S/4/4S/GTS (991.2) (OE Sport Set)S PO TI 5H SO Slip On Built from high grade, heat resistant, ultra lightweight titanium alloys which are sandblasted and coated for durability the Slip On Line is the first step in exhaust modification. Delivering weight savings in excess of 35% over stock, while increasing performance, the exhaust uses the latest innovative technologies in its construction, including parts cast in Akrapovics in house foundry. It is perfectly tuned to give a unique