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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Fel-Pro Exhaust Pipe Flange Gasket for 2011-2015 Subaru Forester 2.5L H4Special Price $16.54 Regular Price $23.99 -
Walker Exhaust Resonator for 2009-2016 Subaru Forester 2.5L H4Special Price $131.27 Regular Price $187.99 -
Walker Resonator To Y-Pipe Exhaust Clamp for 2009-2013 Subaru Forester 2.5L H4Special Price $9.21 Regular Price $12.99Out of stock -
Walker Resonator To Int Pipe Exhaust Clamp for 2014-2016 Subaru Forester 2.5L H4Special Price $9.40 Regular Price $12.99Out of stock -
Walker Resonator Assm To Y-Pipe Exhaust Clamp for 2009-2010 Subaru Forester 2.5L H4Special Price $9.40 Regular Price $12.99Out of stock -
Walker Front Pipe To Converter Front Exhaust Pipe Flange Gasket for 1998 Subaru Forester 2.5L H4Special Price $10.01 Regular Price $13.99 -
Walker Front Pipe To Converter Exhaust Pipe Flange Gasket for 1999-2005 Subaru Forester 2.5L H4Special Price $10.01 Regular Price $13.99 -
Walker Front Converter To Rear Converter Exhaust Pipe Flange Gasket for 1998 Subaru Forester 2.5L H4Special Price $10.01 Regular Price $13.99 -
Fel-Pro EGR Valve Gasket for 2002-2015 Subaru Forester 2.5L H4Special Price $10.20 Regular Price $14.99 -
Walker Resonator Assm Exhaust System Insulator for 1998-2005 Subaru Forester 2.5L H4Special Price $11.48 Regular Price $15.99 -
Walker Muffler Right Exhaust System Insulator for 2009-2013 Subaru Forester 2.5L H4Special Price $11.48 Regular Price $15.99 -
Walker Muffler Left Exhaust System Insulator for 2009-2013 Subaru Forester 2.5L H4Special Price $11.48 Regular Price $15.99 -
Walker Front Converter To Rear Converter Exhaust Pipe Flange Gasket for 2011-2016 Subaru Forester 2.5L H4Special Price $11.70 Regular Price $16.99Out of stock -
Walker Front Pipe Inlet Left Exhaust Pipe Flange Gasket for 2002-2005 Subaru Forester 2.5L H4Special Price $11.87 Regular Price $16.99 -
Walker Front Pipe Inlet Right Exhaust Pipe Flange Gasket for 2002-2005 Subaru Forester 2.5L H4Special Price $11.87 Regular Price $16.99 -
Walker Y-Pipe Outlet Right To Muffler Right Exhaust Pipe Flange Gasket for 2009-2013 Subaru Forester 2.5L H4Special Price $11.98 Regular Price $16.99Out of stock -
Walker Converter Inlet Front Exhaust Pipe Flange Gasket for 2009-2013 Subaru Forester 2.5L H4Special Price $12.11 Regular Price $16.99 -
Walker Y-Pipe To Left Muffler Exhaust Pipe Flange Gasket for 2009-2013 Subaru Forester 2.5L H4Special Price $12.23 Regular Price $16.99Out of stock -
Walker Y-Pipe To Right Muffler Exhaust Pipe Flange Gasket for 2009-2013 Subaru Forester 2.5L H4Special Price $12.23 Regular Price $16.99Out of stock -
Walker Resonator Assm To Muffler Assm Exhaust Pipe Flange Gasket for 1998-2005 Subaru Forester 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 2009-2013 Subaru Forester 2.5L H4Special Price $12.23 Regular Price $16.99Out of stock -
Walker Resonator Assm To Muffler Assm Exhaust Pipe Flange Gasket for 2006-2008 Subaru Forester 2.5L H4Special Price $12.47 Regular Price $17.99Out of stock -
Walker Int Pipe To Muffler Exhaust Pipe Flange Gasket for 2014-2016 Subaru Forester 2.5L H4Special Price $13.62 Regular Price $18.99Out of stock -
Fel-Pro Exhaust Pipe Flange Gasket for 2011-2015 Subaru Forester 2.5L H4Special Price $14.14 Regular Price $19.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 2006-2010 Subaru Forester 2.5L H4Special Price $14.14 Regular Price $19.99 -
Fel-Pro Front Exhaust Pipe Flange Gasket for 2011-2015 Subaru Forester 2.5L H4Special Price $14.14 Regular Price $19.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 2004-2013 Subaru Forester 2.5L H4Special Price $15.02 Regular Price $20.99 -
Fel-Pro Rear Exhaust Pipe Flange Gasket for 2004-2013 Subaru Forester 2.5L H4Special Price $15.23 Regular Price $21.99 -
2 pc Walker Muffler Right Exhaust System Insulators for 2009-2013 Subaru Forester 2.5L H4Special Price $15.60 Regular Price $21.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 2004-2013 Subaru Forester 2.5L H4Special Price $15.76 Regular Price $22.99 -
2 pc Walker Muffler Left Exhaust System Insulators for 2009-2013 Subaru Forester 2.5L H4Special Price $15.92 Regular Price $22.99 -
2 pc Walker Converter Inlet Front Exhaust Pipe Flange Gaskets for 2006-2016 Subaru Forester 2.5L H4Special Price $16.37 Regular Price $22.99 -
2 pc Walker Front Pipe Inlet Exhaust Pipe Flange Gaskets for 1998-2002 Subaru Forester 2.5L H4Special Price $16.37 Regular Price $22.99 -
Walker Rear Converter To Resonator Exhaust Bolt & Spring for 2009-2016 Subaru Forester 2.5L H4Special Price $16.41 Regular Price $22.99Out of stock -
Fel-Pro Center Exhaust Pipe Flange Gasket for 2011-2015 Subaru Forester 2.5L H4Special Price $16.54 Regular Price $23.99 -
Walker Rear Converter To Resonator Assm Exhaust Bolt & Spring for 2006-2008 Subaru Forester 2.5L H4Special Price $16.75 Regular Price $23.99Out of stock -
Walker Converter To Resonator Assm Exhaust Bolt & Spring for 1999-2002 Subaru Forester 2.5L H4Special Price $16.75 Regular Price $23.99Out of stock -
Walker Front Converter To Rear Converter Exhaust Pipe Flange Gasket for 2006-2013 Subaru Forester 2.5L H4Special Price $17.40 Regular Price $24.99Out of stock -
Walker Converter To Resonator Assm Exhaust Pipe Flange Gasket for 1999-2005 Subaru Forester 2.5L H4Special Price $18.98 Regular Price $26.99 -
Walker Rear Converter To Resonator Assm Exhaust Pipe Flange Gasket for 1998 Subaru Forester 2.5L H4Special Price $18.98 Regular Price $26.99 -
3 pc Walker Muffler Assm Exhaust System Insulators for 1998-2008 Subaru Forester 2.5L H4Special Price $20.12 Regular Price $28.99 -
Fel-Pro Exhaust Manifold Gasket Set for 1998-2016 Subaru Forester 2.0L 2.5L H4Special Price $20.30 Regular Price $28.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 2006-2010 Subaru Forester 2.5L H4Special Price $20.63 Regular Price $28.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 2006-2010 Subaru Forester 2.5L H4Special Price $20.63 Regular Price $28.99 -
Walker Rear Converter To Resonator Assm Exhaust Pipe Flange Gasket for 2006-2008 Subaru Forester 2.5L H4Special Price $20.76 Regular Price $29.99Out of stock -
Fel-Pro Front Exhaust Pipe Flange Gasket for 2014-2016 Subaru Forester 2.0L H4Special Price $21.55 Regular Price $30.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 2006-2015 Subaru Forester 2.5L H4Special Price $21.55 Regular Price $30.99 -
Walker Rear Converter To Resonator Exhaust Pipe Flange Gasket for 2009-2016 Subaru Forester 2.5L H4Special Price $21.72 Regular Price $30.99Out of stock

































































