A blast from the past... Last summer, we customized a Red 2021 GMC Sierra 1500 AT4 with a cool air intake and we're STILL thinking about it. #gmcsierraat4 #2021sierra #4x4ing #5point3 #adventureawaits #at4family #bigtruck #chevroletlife #chevyhd #chevysilveradotrailboss #dirtymax #fourbyfour #gmc1500 #gmcat4 #gmcgang #gmcsierra1500at4 #gmcsierraclub #gmctrucksdaily #hp #mudtires #offroadinglife #outdoorliving #sierra #sierra3500hd #sierranation #sixpointtwo #truckdaily #truckmania #truckstagram #x31