Diesel Pickup Dual Exhaust Stack Kit w/ 6" Aussie Cut This Is A Complete Grand Rock Diesel Pickup Dual Stack Kit Includes 2 36" Aussie Cut Chrome Stacks w/ 6" Diameter Each Stack reduces from 6" to 5" The Kit Has A 5" Diameter with 4" Diameter below the y pipe Includes Everything You Need To Give Your Diesel Pickup a "Big Rig" Look