aFe is proud to introduce an all new Takeda dual cat - back exhaust system for the 2015 - 2017 Subaru WRX and WRX STI with the H4 - 2.0L2.5L (t) engines. This performance cat - back exhaust system is constructed out of 3 into dual 2 - 14 mandrel - bent 304 stainless steel tubing and incorporates a mitered merge to evenly distribute exhaust gases resulting in added horsepower and torque. In testing, this system resulted in gains up to 14 horsepower and 22 lbs. x ft. of torque verified by our in house dyno. This cat - back exhaust utilizes dual high - flow 304 stainless steel mufflers to improve performance across the power band while maintaining an aggressive sound. To finish off the exhaust are quad, 304 stainless steel, high - luster, polished 3 - 12 diameter tips. The tips come with laser - etched Takeda logos for an aggressive style. This unit is 100 TIG - Welded by certified craftsmen for race proven strength and durability and is a direct bolt - on system that requires no modifications. All necessary hardware is included for a hassle - free installation.