Create your own custom systems using BORLA® Hot Rod Builder Kits. All components in this kit are 2.5" Outside Diameter (O.D.) T-304 stainless steel which will never rust. Elbows, and u-bends are mandrel bent for maximum flow. Kit contains (4) 45° elbows, (4) 90° elbows, (4) 180° u-bends, and (2) 5' long straight tubing sections. Brushed finish for sharp appearance, it can be polished to a mirror finish prior to installation. Designed for weld in or clamp in installation if clamping, use 3" wide band clamps 18004.