This Magnaflow competition series axle-back for the Subaru WRX/STI 2011-2014 and 2015+ features an aggressive sound combined with your factory cats intact, all while improving exhaust flow and power. This direct bolt on is mandrel bent, and constructed with 100% stainless steel for the tubing (2" to 2.25") along with quad 4" polished stainless steel tips.