The BORLA® 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, or black 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 OE mounting points for ease of installation.