Grand Rock Powerflow Diesel Pickup Dual Stack 5" Angled This Is A Complete Grand Rock Diesel Pickup Dual Stack Kit Includes 2 36" Angled Cut Chrome Stacks This Kit Has A 5" Diameter which reduces to 4" below the y pipe Includes Everything You Need To Give Your Diesel Pickup a "Big Rig" Look Improves Truck Performance With A Better Exhaust Flow