Create your own custom systems using Borla Hot Rod Kits. All components in this kit are T-304 stainless steel which will never rust. Elbows, and u-bends are mandrel bent for maximum flow. Kit contains (4) 45 degree elbows, (4) 90 degree elbows, (4) 180 degree 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. Size is outside diameter.