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 Flange Stud & Nut for 1990-2000 Lexus LS400 4.0L V8Special Price $25.86 Regular Price $36.99 -
Walker Y-Pipe To Right Muffler Assm Exhaust Clamp for 1990-1994 Lexus LS400 4.0L V8Special Price $10.14 Regular Price $13.99 -
Walker Muffler Assm Left Exhaust System Insulator for 1994 Lexus LS400 4.0L V8Special Price $11.72 Regular Price $16.99 -
Walker Muffler Right Exhaust System Insulator for 1990-1994 Lexus LS400 4.0L V8Special Price $9.66 Regular Price $13.99 -
Walker Muffler Left Exhaust System Insulator for 1990-1994 Lexus LS400 4.0L V8Special Price $9.86 Regular Price $13.99 -
Walker Left Extension Pipe To Left Muffler Exhaust Clamp for 1990-1994 Lexus LS400 4.0L V8Special Price $9.93 Regular Price $13.99 -
Walker Y-Pipe To Left Muffler Assm Exhaust Clamp for 1990-1994 Lexus LS400 4.0L V8Special Price $9.93 Regular Price $13.99 -
Walker Muffler Assm Left To Int Pipe Left Exhaust Clamp for 1990-1994 Lexus LS400 4.0L V8Special Price $9.93 Regular Price $13.99 -
Walker Muffler Assm Right To Int Pipe Right Exhaust Clamp for 1990-1994 Lexus LS400 4.0L V8Special Price $10.14 Regular Price $13.99 -
Walker Right Extension Pipe To Right Muffler Exhaust Clamp for 1990-1994 Lexus LS400 4.0L V8Special Price $10.14 Regular Price $13.99 -
Walker Int Pipe Right To Extension Right Exhaust Pipe Flange Gasket for 1990-1994 Lexus LS400 4.0L V8Special Price $10.42 Regular Price $14.99Out of stock -
Walker Int Pipe Left To Extension Left Exhaust Pipe Flange Gasket for 1990-1994 Lexus LS400 4.0L V8Special Price $10.64 Regular Price $14.99Out of stock -
Walker Muffler Assm Right Exhaust System Insulator for 1994 Lexus LS400 4.0L V8Special Price $11.48 Regular Price $15.99 -
2 pc Walker Exhaust Clamps for 1995-1997 Lexus LS400 4.0L V8Special Price $11.51 Regular Price $15.99Out of stock -
Fel-Pro Exhaust Pipe Flange Gasket for 1998-2000 Lexus LS400 4.0L V8Special Price $11.59 Regular Price $16.99 -
Fel-Pro Front Exhaust Pipe Flange Gasket for 1991-1997 Lexus LS400 4.0L V8Special Price $13.42 Regular Price $18.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 1990 Lexus LS400 4.0L V8Special Price $13.42 Regular Price $18.99 -
Walker Muffler Assm Left Exhaust System Insulator for 1990-1993 Lexus LS400 4.0L V8Special Price $13.63 Regular Price $18.99 -
Walker Muffler Assm Right Exhaust System Insulator for 1990-1993 Lexus LS400 4.0L V8Special Price $13.63 Regular Price $18.99 -
Fel-Pro Exhaust Pipe Flange Gasket for 1998-2000 Lexus LS400 4.0L V8Special Price $13.72 Regular Price $19.99 -
Walker Converter Rear To Y-Pipe Exhaust Pipe Flange Gasket for 1990 Lexus LS400 4.0L V8Special Price $14.72 Regular Price $20.99 -
4 pc Walker Exhaust System Insulators for 1995-1997 Lexus LS400 4.0L V8Special Price $18.83 Regular Price $26.99Out of stock -
2 pc Walker Exhaust Pipe Flange Gaskets for 1995-1997 Lexus LS400 4.0L V8Special Price $21.48 Regular Price $30.99









































