These cats are turn key with block off plate for the front catalytic converter already done application needed to run catalytic converters in 2004-2008 Acura TL or 2007-2009 Acura MDX or other chassis if you decide to upgrade engine to J37A1/A4 that don’t use the exhaust tube for the EGR valve this is a must.

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J37A1 J37A4 Swap Catalytic Converters Acura TL MDX 3.7L 2010-2014 Turn Key Block.