The 'D' multiplier figure, or in this case 1.5D, is referring to a bend that has a centerline radius that is '1.5 times the outside diameter' of the material. Knowing how to measure centerline radius is an important part of sourcing the correct fabrication components that the specific job requires. Oftentimes, a set of headers may require a mix of both standard and tight radius bends, or a custom downpipe might require the tightest bend radius possible to clear an existing part of the vehicle. If the CLR of the bend is too 'tight' or too 'loose' for the application the end result might mean that the fabricated item may not fit the application properly, or it may mean that the inlet or outlet of the fabricated item will be way out of alignment. When fabricating a set of headers, a downpipe, or an exhaust one very critical dimension to pay attention to is the Centerline Radius of the bend. The CLR of a bend is the distance from center of the bending die to the axis (centerline) of the tube or pipe. We are frequently asked for clarification of the meaning of Centerline Radius, often referenced as CLR. Standard V-Band Clamp (0.170' Apex Width) Mufflers, Resonators, Catalytic Converters
