Emission

Fits:
2001-2004 Jeep Wrangler TJ w/ 2.4L or 2.5L engine
2001 Jeep Wrangler TJ w/ 4.0L engine; Europe
2003 Jeep Wrangler TJ w/ 4.0L engine; Europe II or Europe III emissions 
2002-2003 Jeep Liberty KJ w/ 2.4L engine; after Catalytic Converter

Fits:
2003-2006 Jeep Wrangler TJ w/ 2.4L engine
2003-2005 Jeep Liberty KJ w/ 2.4L engine

Fits:
2001-2004 Jeep Wrangler TJ w/ 2.4L or 2.5L engine
2001 Jeep Wrangler TJ w/ 4.0L engine; Europe
2003 Jeep Wrangler TJ w/ 4.0L engine
2002-2003 Jeep Liberty KJ w/ 2.4L engine

Fits:
2001-2002 Jeep Wrangler TJ w/ 2.5L engine; Before catalyst
2003-2004 Jeep Wrangler TJ w/ 2.4L engine; Before catalyst
2001-2003 Jeep Wrangler TJ w/ 4.0L engine; Before catalyst, rear sensor
2002-2003 Jeep Liberty KJ w/ 2.4L or 3.7L engine; Before catalyst, front sensor
2001 Jeep Grand Cherokee WJ w/ 4.0L engine; w/ California emissions; Before catalyst, rear sensor
2002-2003 Jeep Grand Cherokee WJ w/ 4.0L engine; Before catalyst, rear sensor
2003 Jeep Grand Cherokee WJ w/ 4.0L engine; After catalyst, front sensor.

Fits:
2003-2004 Jeep Wrangler TJ w/ 2.4L engine
2005-2006 Jeep Wrangler TJ w/ 4.0L engine
2002-2003 Jeep Liberty KJ w/ 2.4L engine
2002-2004 Jeep Liberty KJ w/ 3.7L engine
2001-2004 Jeep Grand Cherokee WJ w/ 4.7L engine
2005-2010 Jeep Grand Cherokee WK w/ 3.7L engine
2006-2010 Jeep Grand Cherokee WK w/ 5.7L engine
2006-2010 Jeep Commander XK; XK (US) model w/ 3.7L, 4.7L or 5.7L engine
2006-2010 Jeep Commander XH; XH (Europe) model w/ 4.7L or 5.7L engine

Fits:
2003-2006 Jeep Wrangler TJ w/ 2.4L engine; w/ thread-in pcv valve
2003-2005 Jeep Liberty KJ w/ 2.4L engine; w/ thread-in pcv valve

Fits:
2005-2010 Jeep Grand Cherokee WK w/ 3.7L, 4.7L, 5.7L or 6.1L Engine
2006-2010 Jeep Commander XK w/ 3.7L, 4.7L or 5.7L Engine
2004-2007 Jeep Liberty KJ w/ 3.7L Engine

Fits:
2003-2004 Jeep Liberty KJ
2004 Jeep Wrangler TJ

Fits:
2003 Jeep Liberty KJ

Fits:
2002-2003 Jeep Liberty KJ w/ 2.4L Engine
2003 Jeep Wrangler TJ w/ 2.4L Engine

Fits:
2002-2003 Jeep Liberty KJ w/ 3.7L Engine
2002-2004 Jeep Grand Cherokee WJ
2007 Jeep Grand Cherokee WK
2007.2010 Jeep Wrangler JK
2008 Jeep Commander XK

Fits:
2002-2004 Jeep Grand Cherokee WJ w/ 4.0L or 4.7L Engine
2002-2003 Jeep Liberty KJ w/ 2.4L or 3.7L Engine
2007 Jeep Wrangler JK w/ 3.8L Engine