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 2013-2014 Subaru WRX 2.5L H4Special Price $15.02 Regular Price $20.99 -
Fel-Pro Rear Exhaust Pipe Flange Gasket for 2013-2014 Subaru WRX 2.5L H4Special Price $15.23 Regular Price $21.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 2013-2014 Subaru WRX 2.5L H4Special Price $15.76 Regular Price $22.99 -
Fel-Pro Exhaust Manifold Gasket Set for 2013-2016 Subaru WRX 2.0L 2.5L H4Special Price $20.30 Regular Price $28.99 -
Fel-Pro Front Exhaust Pipe Flange Gasket for 2015-2016 Subaru WRX 2.0L H4Special Price $21.99 Regular Price $30.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 2013-2014 Subaru WRX 2.5L H4Special Price $28.13 Regular Price $39.99























