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 Flex Pipe To Rear Converter Exhaust Pipe Flange Gasket for 2006-2007 Ford Focus 2.0L L4Special Price $9.38 Regular Price $12.99Out of stock -
Walker Exhaust Pipe Flange Gasket for 2012-2017 Ford Focus 2.0L L4Special Price $9.77 Regular Price $13.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 2009-2011 Ford Focus 2.0L L4Special Price $14.46 Regular Price $20.99 -
Fel-Pro Rear Exhaust Pipe Flange Gasket for 2013-2015 Ford Focus 2.0L L4Special Price $14.76 Regular Price $20.99 -
Walker Front Converter To Rear Converter Exhaust Pipe Flange Gasket for 2005-2007 Ford Focus 2.0L 2.3L L4Special Price $9.38 Regular Price $12.99Out of stock -
Walker Front Converter To Front Pipe Exhaust Pipe Flange Gasket for 2003-2011 Ford Focus 2.0L 2.3L L4Special Price $9.38 Regular Price $12.99Out of stock -
Walker Exhaust Pipe Flange Gasket for 2008-2011 Ford Focus 2.0L L4Special Price $9.38 Regular Price $12.99Out of stock -
Walker Front Pipe To Rear Converter Exhaust Pipe Flange Gasket for 2005-2007 Ford Focus 2.0L L4Special Price $9.38 Regular Price $12.99Out of stock -
Walker Converter To Extension Pipe Exhaust Pipe Flange Gasket for 2000-2004 Ford Focus 2.0L L4Special Price $9.66 Regular Price $13.99Out of stock -
Walker Front Pipe To Rear Converter Exhaust Pipe Flange Gasket for 2003-2004 Ford Focus 2.3L L4Special Price $9.86 Regular Price $13.99Out of stock -
Fel-Pro EGR Valve Gasket for 2003-2010 Ford Focus 2.0L 2.3L L4Special Price $10.09 Regular Price $13.99 -
Walker Connector Rear To Resonator Assm Exhaust Clamp for 2008-2011 Ford Focus 2.0L L4Special Price $10.24 Regular Price $14.99 -
Walker Connector Front To Muffler Assm Exhaust Clamp for 2008-2011 Ford Focus 2.0L L4Special Price $10.24 Regular Price $14.99 -
Walker Converter Rear To Muffler Assm Front Exhaust Clamp for 2003-2007 Ford Focus 2.0L 2.3L L4Special Price $10.24 Regular Price $14.99 -
Walker Converter Rear To Connector Front Exhaust Clamp for 2008-2011 Ford Focus 2.0L L4Special Price $10.24 Regular Price $14.99 -
Walker Front Muffler Assm To Rear Exhaust Clamp for 2000-2007 Ford Focus 2.0L 2.3L L4Special Price $10.24 Regular Price $14.99 -
Walker Muffler Assm To Connector Rear Exhaust Clamp for 2008-2011 Ford Focus 2.0L L4Special Price $10.46 Regular Price $14.99 -
Fel-Pro Front Exhaust Pipe Flange Gasket for 2015-2016 Ford Focus 1.0L L3Special Price $12.31 Regular Price $17.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 2003-2008 Ford Focus 2.0L 2.3L L4Special Price $12.33 Regular Price $17.99 -
Walker Converter To Extension Pipe Exhaust Pipe Flange Gasket for 2000-2004 Ford Focus 2.0L L4Special Price $12.69 Regular Price $17.99Out of stock -
Walker Front Pipe To Rear Converter Exhaust Pipe Flange Gasket for 2008-2011 Ford Focus 2.0L L4Special Price $12.95 Regular Price $17.99Out of stock -
Walker Extension Pipe To Muffler Assm Front Exhaust Pipe Flange Gasket for 2000-2004 Ford Focus 2.0L L4Special Price $12.95 Regular Price $17.99Out of stock -
Walker Exhaust System Insulator for 2008-2009 Ford Focus 2.0L L4Special Price $13.35 Regular Price $18.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 2000-2004 Ford Focus 2.0L L4Special Price $13.42 Regular Price $18.99 -
Walker Front Exhaust Pipe Connector for 2008-2011 Ford Focus 2.0L L4Special Price $13.62 Regular Price $18.99 -
Walker Exhaust Pipe Connector for 2008-2011 Ford Focus 2.0L L4Special Price $13.62 Regular Price $18.99 -
Walker Rear Exhaust Pipe Connector for 2008-2011 Ford Focus 2.0L L4Special Price $13.90 Regular Price $19.99 -
Walker Converter Inlet Exhaust Pipe Flange Gasket for 2000-2004 Ford Focus 2.0L L4Special Price $15.56 Regular Price $21.99 -
2 pc Walker Converter Rear Exhaust System Insulators for 2003-2009 Ford Focus 2.0L 2.3L L4Special Price $19.74 Regular Price $27.99 -
2 pc Walker Muffler Assm Front Exhaust System Insulators for 2000-2004 Ford Focus 2.0L L4Special Price $19.74 Regular Price $27.99 -
2 pc Walker Exhaust System Insulators for 2008-2009 Ford Focus 2.0L L4Special Price $19.74 Regular Price $27.99 -
Fel-Pro Exhaust Manifold Gasket Set for 2005-2011 Ford Focus 2.0L 2.3L L4Special Price $36.33 Regular Price $51.99























































