The Borla 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 ensures a comfortable driving experience and guarantees a drone-free exhaust system. Our Axle-Back bolts on to the factory flange for ease of installation and features a 3.5″ x 2.75″ oval exhaust tip. Whether you are driving through the city or taking the road less traveled, choose Borla 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 Exhaust System is built from premium T-304 series stainless steel to give you the absolute best in performance and durability.