The BORLA(r) 11967 system developed for Subaru's sixth generation Outback has been specifically engineered for the 2.5L 4 - cylinder engine. The S - Type sound level provides a more aggressive sound over stock and accentuates the Subaru Boxer engine rumble. BORLA(r) ensures a comfortable driving experience and guarantees a drone - free exhaust system. Ultra - smooth mandrel bends ensure maximum flow power, and precision computer numerical control (CNC) manufacturing ensures an accurate fit. Our Axle - Back bolts on to the factory flange for ease of installation and features a 3.5 x 2.75 oval polished T - 304 stainless steel exhaust tip. Whether you are driving through the city or taking the road less traveled, choose BORLA(r) for your adventures., System Features, Axle - Back System, 3.5 x 2.75 Oval Polished, S - Type Sound Level, No - Drone, T - 304 Stainless Steel Construction, Bolt - On Installation, Million Mile Warranty, Each BORLA(r) Exhaust System is built from premium T - 304 series stainless steel to give you the absolute best in performance and durability.