This is a Brand New Passenger Side OE Chevrolet , GMC Exhaust Manifold for the 8.1L , V-8 Engine with out AIR Pump Provision.Contents : Passenger Side Exhaust ManifoldManufacture : OEM Chevrolet / GMCNOTE : Does Not Have SMOG / AIR PUMP PROVISION.Makes / Models : AVALANCHE 2500 : 02-06, 8.1LSIERRA 2500 PICKUP 01-07, 8.1L,SIERRA 3500 PICKUP : 01-07, 8.1L SILVERADO 2500 PICKUP : 01-07, 8.1LSILVERADO 3500 PICKUP : 01-07, 8.1LSUBURBAN 2500 : 01-06, 8.1LYUKON XL 2500 : 01-06, 8.1L