The Invidia Exhaust adapter/extension is a necessity to allow an Invidia cat back system to bolt directly up to a stock down pipe for the following models:2004-2008 Subaru Forester XT (SG) 2001-2007 Subaru WRX 2001-2005 Subaru WRX STIMade from high quality 304SS stainless steel, robotically welded with reinforced flanges. You can rely on Invidia for a perfect fit, every time.Bolts and gaskets included
