Rev9Power Rev9_CB-014; Stainless Steel Performance Catback Exhaust For Subaru Impreza WRX STI 02-07 EJ20 EJ25 Product Details 02-07 Subaru WRX or STii 3" full stainless polish catback exhaust This will fit : - 2002 2003 2004 2005 2006 2007 Subaru WRX STi EJ20/EJ25 100% SUS-304 Stainless Steel with computerized mandrel-bent "- Tip size is 4.5" with 3" piping. Includes a silencer - CNC machine flanges for strong solid support - TIG weld for strength and durability - 3 stage polish - Increases 20-30 horsepower - Straight through design and bolt-on installation