1.625in Stainless Steel Header w/ 2.25in Collector

It is specifically designed to enhance exhaust flow efficiency through its 1.625" primary tubes and a 2.25" collector, leading to increased engine power and responsiveness. Crafted from premium T-304 austenitic stainless steel, this header provides superior durability and corrosion resistance compared to T-400 series alternatives. It incorporates a unique, stiffened flex joint to reduce stress and improve longevity, even under demanding driving conditions. The use of ultra-smooth mandrel bends ensures maximum flow, while precision CNC manufacturing guarantees an accurate fit. This header is covered by California Air Resources Board Executive Order (E.O.) # D-276-12 for the 2001-2003 Subaru Impreza WRX models. Gaskets are not included; reuse O.E. gaskets or purchase them separately. This header is designed for 2001-2003 Subaru Impreza WRX 2.0L 4 Cyl. Turbo Automatic/Manual Transmission All Wheel Drive 4 Door/Wagon. It is also compatible with 2002-2014 WRX and 2004-2018 STI models, as well as potentially 2001-2014 Legacy GT models, according to some sources. The product is made in the USA and backed by a Borla Million-Mile Warranty.