Description: 100% Brand New Items, Never Used Or Installed High Performance Stainless Steel Header Kit CNC Machined T-304 Mandrel Bent Stainless Steel Piping And TIG Welded Steel Flanges Made By OEM Approved and ISO Certified Manufacturers With Materials That Meets Or Exceeds Strict OEM Requirements Direct Bolt-On Item; No Modifications Required Improves Engine Performance And Increase Horsepower By Significantly Reducing Exhaust Flow Restriction Increase High Flow Air, Instantly Gain 10 -15 Hp. / Tq. Specifications (Estimated): Inlet: 1.5" Outlet: 2.25" Includes Pictured Hardware * O2 Simulators May Be Required If A CEL Is Triggered * No Installation Guides Are Included, We Highly Recommend To Seek Professional Installation Package including: Just as pictures show 1 x Header exhaust system All necessary hardware, bolts, and gaskets included Fitment: 1998-2005 Subaru Impreza 2.5L Non-Turbo(EXCET 1999,2004 Subaru Impreza,2002 Subaru Impreza TS Wagon)