This Takeda dual cat - back exhaust system for the 2015 - 2017 Subaru WRX and WRX STI delivers true bolt - on performance with gains up to 14 horsepower and 22 lbs. x ft. of torque as measured on our in - house dyno. 3 into 2 - 14 mandrel - bent 304 stainless steel tubing, mitered merge and dual, stainless steel high flow mufflers evenly distribute exhaust gases to improve performance across the power band while maintaining an aggressive sound. Quad, 304 stainless steel, blue flame 3 - 12 diameter tips with laser - etched Takeda logos complete the look. Performance Gains In house dyno testing produced gains of up to 14 horsepower and 22 lbs. x ft. torque.304 Stainless Steel Construction 3 - 2 - 14 mandrel - bent, 304 stainless steel tubing for maximum performance, corrosion resistance, strength, and durability. Quad 3 - 12 Blue Flame Stainless Steel Exhaust Tips Quad 3 - 12 diameter blue flame finished stainless steel exhaust tips. The tips come with a laser - etched Takeda logo for a custom look. Flow and Performance Dual high flow 304 stainless steel mufflers are used to absorb high pitch tones producing a powerful sound. Mitered Merge A true mitered merge is used to maximize scavenging and evenly distribute exhaust gases thru the muffler reducing un - wanted back pressure. TIG - Welded 100 TIG - welded for race proven strength and durability. Simple, Hassle Free Installation This system is designed to be a direct bolt - on system with no cutting or modifications required. Also included is high quality stainless steel hardware for a hassle - free installation.