T-304 Stainless Steel Exhaust Header

The Flash Shark Exhaust Header is engineered to boost the performance of your 1997-2005 Subaru Impreza 2.5L (non-turbo) and compatible Legacy GT models. This racing header enhances horsepower and torque by optimizing exhaust flow and reducing back pressure. Its Unequal Length (UEL) design is key to achieving the signature deep, throaty Boxer engine sound. The inlet size is 1.50 inches, and the outlet size is 2.25 inches, specifically optimized for 2.5L non-turbo engines to maintain high exhaust gas velocity. Installation is straightforward with a direct bolt-on design, requiring no welding or modifications. The header includes pre-drilled bungs for O2 sensors, and typically comes with necessary gaskets and hardware. While a Check Engine Light (CEL) is not usually triggered with correct sensor installation, some vehicles may benefit from an O2 spacer or a custom tune to maximize the 15-25 HP gains and optimize ECU performance. This header is intended for off-road or track use and is not CARB legal for street use in all states. Verified fitment includes specific Subaru Impreza RS (1998-2005, various body styles), Impreza TS (2002-2004 Wagon), Impreza Outback/Outback Sport (2002-2005 Wagon), and Legacy GT (1997-2005 Wagon, WITHOUT Factory Oil Cooler ONLY), all requiring the factory-equipped 2.5L Boxer 4-Cylinder Engine.