It helps improve fuel economy and extends the service life of the catalytic converter For Sierra 1500 V8-4.8 V8-5.3 V8-6.0 V8-6.2 2008 2009 2010 2011 2012 2013, For Sierra 2500 3500 HD V8-6.0 Pickup 2008 2009 2010 2011, For Yukon V8-4.8 2008 2009 For Yukon V8-5.3 V8-6.2 2008 2009 2010 2011 2012 2013 2014, For Yukon V8-6.0 2008 2009 2010 2011 2012 2013, For Yukon XL 1500 V8-5.3 V8-6.2 2008 2009 2010 2011 2012 2013 2014 For Yukon XL 1500 V8-6.0 2008 2009, For Yukon XL 2500 V8-6.0 2008 2009 2010 2011 2012 2013, Part Number: 234-4256, 234-4668 It features shock resistance, performance, high stability, and durability
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