Emission controls in older carbureted engines relied on forcing additional air from pumps and valves located just before the exhaust manifold to ensure better burns. This is known as a secondary air injection system, and today has evolved to increase the efficiency of Catalytic Converters. Failed pumps and leaks are common signs of a bad Air Injection System, leading to off air and fuel ratios and poor acceleration. Remember to check the Manifold Gaskets and Seals for wear and tear when examining the exhaust.
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Walker Converter To Resonator Assm Exhaust Pipe Flange Gasket for 2000-2005 Subaru Impreza 2.5L H4Special Price $18.46 Regular Price $25.99 -
3 pc Walker Exhaust System Insulators for 1996-2001 Subaru Impreza 2.2L H4Special Price $19.71 Regular Price $27.99 -
Fel-Pro Exhaust Manifold Gasket Set for 1993-2015 Subaru Impreza 1.8L 2.0L 2.2L 2.5L H4Special Price $20.72 Regular Price $29.99 -
Walker Quiet-Flow Right Exhaust Muffler for 2008-2011 Subaru Impreza 2.5L H4Special Price $183.60 Regular Price $261.99 -
Walker Resonator To Y-Pipe Exhaust Clamp for 2008-2011 Subaru Impreza 2.5L H4Special Price $9.21 Regular Price $12.99Out of stock -
Walker Resonator To Int Pipe Exhaust Clamp for 2012-2016 Subaru Impreza 2.0L H4Special Price $9.40 Regular Price $12.99Out of stock -
Walker Front Pipe To Converter Exhaust Pipe Flange Gasket for 2000-2005 Subaru Impreza 2.5L H4Special Price $9.81 Regular Price $13.99 -
Fel-Pro EGR Valve Gasket for 2002-2014 Subaru Impreza 2.5L H4Special Price $9.99 Regular Price $13.99 -
Walker Exhaust Pipe Flange Gasket for 1993-2001 Subaru Impreza 1.8L 2.2L 2.5L H4Special Price $10.01 Regular Price $13.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 1995 Subaru Impreza 2.2L H4Special Price $11.40 Regular Price $15.99 -
Walker Exhaust System Insulator for 1993-1996 Subaru Impreza 1.8L H4Special Price $11.48 Regular Price $15.99 -
Walker Front Converter To Rear Converter Exhaust Pipe Flange Gasket for 2012-2016 Subaru Impreza 2.0L H4Special Price $11.70 Regular Price $16.99Out of stock -
Walker Muffler Right Exhaust System Insulator for 2008-2011 Subaru Impreza 2.5L H4Special Price $11.72 Regular Price $16.99 -
Walker Muffler Left Exhaust System Insulator for 2008-2011 Subaru Impreza 2.5L H4Special Price $11.72 Regular Price $16.99 -
Walker Int Pipe Exhaust System Insulator for 2012-2016 Subaru Impreza 2.0L H4Special Price $11.72 Regular Price $16.99 -
Walker Converter Inlet Front Exhaust Pipe Flange Gasket for 2008-2011 Subaru Impreza 2.5L H4Special Price $11.87 Regular Price $16.99 -
Walker Exhaust Pipe Flange Gasket for 1993-2001 Subaru Impreza 1.8L 2.2L 2.5L H4Special Price $11.98 Regular Price $16.99Out of stock -
Walker Int Pipe To Muffler Exhaust Pipe Flange Gasket for 2012-2016 Subaru Impreza 2.0L H4Special Price $11.98 Regular Price $16.99Out of stock -
Walker Resonator Assm To Muffler Assm Exhaust Pipe Flange Gasket for 2006-2007 Subaru Impreza 2.5L H4Special Price $12.21 Regular Price $16.99Out of stock -
Walker Y-Pipe Outlet Right To Muffler Right Exhaust Pipe Flange Gasket for 2008-2011 Subaru Impreza 2.5L H4Special Price $12.23 Regular Price $16.99Out of stock -
Walker Resonator Assm To Muffler Assm Exhaust Pipe Flange Gasket for 2000-2011 Subaru Impreza 2.5L H4Special Price $12.23 Regular Price $16.99Out of stock -
Walker Y-Pipe Outlet Left To Muffler Left Exhaust Pipe Flange Gasket for 2008-2011 Subaru Impreza 2.5L H4Special Price $12.23 Regular Price $16.99Out of stock -
Walker Exhaust Pipe Flange Gasket for 1993-1996 Subaru Impreza 1.8L H4Special Price $13.60 Regular Price $18.99Out of stock -
Fel-Pro Exhaust Pipe Flange Gasket for 2006-2011 Subaru Impreza 2.5L H4Special Price $13.85 Regular Price $19.99 -
Fel-Pro Front Exhaust Pipe Flange Gasket for 2012-2015 Subaru Impreza 2.0L H4Special Price $14.14 Regular Price $19.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 1995 Subaru Impreza 2.2L H4Special Price $14.14 Regular Price $19.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 2004-2014 Subaru Impreza 2.5L H4Special Price $14.72 Regular Price $20.99 -
Fel-Pro Front Exhaust Pipe Flange Gasket for 2002-2005 Subaru Impreza 2.0L H4Special Price $15.02 Regular Price $20.99 -
Fel-Pro Rear Exhaust Pipe Flange Gasket for 2002-2014 Subaru Impreza 2.0L 2.5L H4Special Price $15.23 Regular Price $21.99 -
2 pc Walker Muffler Assm Exhaust System Insulators for 2000-2005 Subaru Impreza 2.5L H4Special Price $15.60 Regular Price $21.99 -
2 pc Walker Muffler Left Exhaust System Insulators for 2008-2010 Subaru Impreza 2.5L H4Special Price $15.60 Regular Price $21.99 -
2 pc Walker Exhaust System Insulators for 1993-1999 Subaru Impreza 1.8L 2.5L H4Special Price $15.60 Regular Price $21.99 -
2 pc Walker Muffler Right Exhaust System Insulators for 2008-2010 Subaru Impreza 2.5L H4Special Price $15.92 Regular Price $22.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 1995 Subaru Impreza 2.2L H4Special Price $16.08 Regular Price $22.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 2002-2014 Subaru Impreza 2.0L 2.5L H4Special Price $16.08 Regular Price $22.99 -
Walker Rear Converter To Resonator Assm Exhaust Pipe Flange Gasket for 2008-2011 Subaru Impreza 2.5L H4Special Price $16.13 Regular Price $22.99Out of stock -
2 pc Walker Converter Inlet Front Exhaust Pipe Flange Gaskets for 2006-2016 Subaru Impreza 2.0L 2.5L H4Special Price $16.37 Regular Price $22.99 -
Walker Rear Converter To Resonator Exhaust Bolt & Spring for 2008-2016 Subaru Impreza 2.0L 2.5L H4Special Price $16.41 Regular Price $22.99Out of stock -
Walker Rear Converter To Resonator Assm Exhaust Bolt & Spring for 2006-2011 Subaru Impreza 2.5L H4Special Price $16.41 Regular Price $22.99Out of stock -
2 pc Walker Front Pipe Inlet Exhaust Pipe Flange Gaskets for 2000-2005 Subaru Impreza 2.5L H4Special Price $16.71 Regular Price $23.99 -
2 pc Walker Exhaust Pipe Flange Gaskets for 1993-1999 Subaru Impreza 1.8L 2.5L H4Special Price $16.71 Regular Price $23.99 -
Walker Converter To Resonator Exhaust Bolt & Spring for 2008-2010 Subaru Impreza 2.5L H4Special Price $16.75 Regular Price $23.99Out of stock -
Fel-Pro Front Exhaust Pipe Flange Gasket for 2012-2015 Subaru Impreza 2.0L H4Special Price $16.88 Regular Price $23.99 -
Walker Front Converter To Rear Converter Exhaust Pipe Flange Gasket for 2006-2011 Subaru Impreza 2.5L H4Special Price $17.05 Regular Price $23.99Out of stock -
Walker Exhaust Pipe Flange Gasket for 1995-2001 Subaru Impreza 2.2L H4Special Price $18.09 Regular Price $25.99 -
3 pc Walker Muffler Assm Exhaust System Insulators for 2006-2007 Subaru Impreza 2.5L H4Special Price $20.12 Regular Price $28.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 2006-2011 Subaru Impreza 2.5L H4Special Price $20.21 Regular Price $28.99

































































