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 1991-2006 Nissan Sentra 1.6L 1.8L 2.0L 2.5L L4Special Price $11.11 Regular Price $15.99 -
Walker Exhaust System Insulator for 1986-2000 Nissan Sentra 1.6L 2.0L L4Special Price $11.48 Regular Price $15.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 2000-2002 Nissan Sentra 1.8L L4Special Price $11.62 Regular Price $16.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 2000-2006 Nissan Sentra 1.8L 2.0L L4Special Price $11.71 Regular Price $16.99 -
2 pc Walker Exhaust System Insulators for 1986-1988 Nissan Sentra 1.6L L4Special Price $15.92 Regular Price $22.99 -
Walker Front Converter To Rear Converter Exhaust Pipe Flange Gasket for 2002-2006 Nissan Sentra 2.5L L4Special Price $17.38 Regular Price $24.99 -
3 pc Walker Exhaust System Insulators for 1991-1994 Nissan Sentra 2.0L L4Special Price $19.71 Regular Price $27.99 -
3 pc Walker Muffler Assm Exhaust System Insulators for 2007-2012 Nissan Sentra 2.0L L4Special Price $20.12 Regular Price $28.99 -
Fel-Pro Rear Exhaust Pipe Flange Gasket for 2013-2016 Nissan Sentra 1.8L L4Special Price $20.21 Regular Price $28.99 -
Fel-Pro EGR Valve Gasket for 1991-1993 Nissan Sentra 2.0L L4Special Price $8.98 Regular Price $12.99 -
Walker Exhaust Pipe Flange Gasket for 1991-2001 Nissan Sentra 2.0L L4Special Price $9.38 Regular Price $12.99Out of stock -
Walker Converter To Resonator Assm Exhaust Pipe Flange Gasket for 1995-1999 Nissan Sentra 1.6L L4Special Price $9.38 Regular Price $12.99Out of stock -
Walker Rear Front Pipe to Converter Exhaust Pipe Flange Gasket for 1995-1999 Nissan Sentra 1.6L L4Special Price $9.38 Regular Price $12.99Out of stock -
Walker Exhaust Clamp for 1982-1986 Nissan Sentra 1.5L 1.6L L4Special Price $9.52 Regular Price $13.99 -
Walker Rear Converter To Resonator Assm Exhaust Pipe Flange Gasket for 2002-2006 Nissan Sentra 2.5L L4Special Price $9.57 Regular Price $13.99Out of stock -
Walker Int Pipe To Converter Exhaust Pipe Flange Gasket for 1991-1996 Nissan Sentra 1.6L L4Special Price $9.57 Regular Price $13.99Out of stock -
Walker Exhaust Pipe Flange Gasket for 1991-1994 Nissan Sentra 2.0L L4Special Price $9.66 Regular Price $13.99Out of stock -
Walker Converter To Resonator Assm Exhaust Pipe Flange Gasket for 1991-1994 Nissan Sentra 1.6L L4Special Price $9.66 Regular Price $13.99Out of stock -
Fel-Pro EGR Valve Gasket for 1982-1999 Nissan Sentra 1.5L 1.6L 2.0L L4Special Price $9.68 Regular Price $13.99 -
Walker Muffler To Tail Pipe Exhaust Clamp for 1991 Nissan Sentra 1.6L L4Special Price $9.72 Regular Price $13.99 -
Walker Extension Pipe To Muffler Exhaust Clamp for 1991 Nissan Sentra 1.6L L4Special Price $10.14 Regular Price $13.99 -
Walker Resonator Assm To Muffler Assm Exhaust Pipe Flange Gasket for 2007-2012 Nissan Sentra 2.0L L4Special Price $10.45 Regular Price $14.99Out of stock -
Walker Resonator Assm To Muffler Assm Exhaust Pipe Flange Gasket for 2013-2017 Nissan Sentra 1.8L L4Special Price $10.60 Regular Price $14.99Out of stock -
Walker Int Pipe To Muffler Assm Exhaust Pipe Flange Gasket for 2003-2006 Nissan Sentra 1.8L L4Special Price $10.82 Regular Price $14.99Out of stock -
Walker Exhaust Pipe Flange Gasket for 2000-2002 Nissan Sentra 1.8L L4Special Price $10.82 Regular Price $14.99Out of stock -
Walker Exhaust Pipe Flange Gasket for 1989-1993 Nissan Sentra 1.6L L4Special Price $10.97 Regular Price $15.99Out of stock -
Walker Front Pipe Inlet Front Exhaust Pipe Flange Gasket for 1995-1999 Nissan Sentra 1.6L L4Special Price $10.97 Regular Price $15.99Out of stock -
Walker Front Pipe Inlet Exhaust Pipe Flange Gasket for 1991-1996 Nissan Sentra 1.6L L4Special Price $10.97 Regular Price $15.99Out of stock -
Walker Exhaust Pipe Flange Gasket for 1986-1988 Nissan Sentra 1.6L L4Special Price $11.28 Regular Price $15.99Out of stock -
Fel-Pro Exhaust Pipe Flange Gasket for 1986-1990 Nissan Sentra 1.6L L4Special Price $11.30 Regular Price $15.99 -
Walker Exhaust Pipe Flange Gasket for 2000-2001 Nissan Sentra 2.0L L4Special Price $11.38 Regular Price $15.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 1991-1999 Nissan Sentra 2.0L L4Special Price $11.47 Regular Price $15.99 -
Walker Resonator Assm Exhaust System Insulator for 1991-1999 Nissan Sentra 1.6L L4Special Price $11.48 Regular Price $15.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 1991-1999 Nissan Sentra 1.6L L4Special Price $11.62 Regular Price $16.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 1989-1999 Nissan Sentra 1.6L L4Special Price $11.62 Regular Price $16.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 2007-2012 Nissan Sentra 2.0L L4Special Price $11.64 Regular Price $16.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 2013-2016 Nissan Sentra 1.8L L4Special Price $11.71 Regular Price $16.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 1991-2012 Nissan Sentra 2.0L 2.5L L4Special Price $11.71 Regular Price $16.99 -
Walker Exhaust Pipe Flange Gasket for 1991-2001 Nissan Sentra 2.0L L4Special Price $12.45 Regular Price $17.99 -
2 pc Walker Exhaust Pipe Flange Gaskets for 1982-1986 Nissan Sentra 1.5L 1.6L L4Special Price $12.59 Regular Price $17.99Out of stock -
Fel-Pro Exhaust Pipe Flange Gasket for 1983-1987 Nissan Sentra 1.7L L4Special Price $12.62 Regular Price $17.99 -
Fel-Pro EGR Valve Gasket for 2000-2002 Nissan Sentra 1.8L 2.0L L4Special Price $12.66 Regular Price $17.99 -
Walker Front Converter To Rear Converter Exhaust Pipe Flange Gasket for 2003-2006 Nissan Sentra 1.8L L4Special Price $12.70 Regular Price $17.99 -
Walker Front Pipe Front to Rear Exhaust Pipe Flange Gasket for 1995-1999 Nissan Sentra 1.6L L4Special Price $13.12 Regular Price $18.99Out of stock -
Walker Front Pipe To Int Pipe Exhaust Pipe Flange Gasket for 1991-1996 Nissan Sentra 1.6L L4Special Price $13.39 Regular Price $18.99Out of stock -
Fel-Pro Exhaust Pipe Flange Gasket for 2007-2012 Nissan Sentra 2.5L L4Special Price $13.89 Regular Price $19.99

































































