The BORLA(r) Axle - Back system for the fifth generation Forester is tailored specifically for the 2.5L Boxer engine. It provides a more aggressive sound over the stock system without adding any drone. The 11966 weighs less than the factory system, and features a 3.5 polished T - 304 stainless steel tip. Ultra - smooth mandrel bends ensure maximum flow power, and precision computer numerical control (CNC) manufacturing ensures an accurate fit. System bolts directly to the O.E. mounting points for ease of installation. A black tip is also available on system 11966CB., System Features, Axle - Back System, 3.5 Polished T - 304 Stainless Steel Tip, 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 Stainless Steel to give you the absolute Best in Performance and durability.