Choose desired diameter.  Dimensions listed below for each bend.  Diameter is measured on the OD of the pipe, bend radius is measured from from center of bend to centerline of pipe.  Legs are measured from tangent of bend to the end.  Each end of aluminum bends is bead-rolled for better use as intercooler plumbing.

2" diameter, 3.125" bend radius, 6.75" legs, .079" wall tubing

2.5" diameter, 4.375"" bend radius, 6" legs, .079" wall tubing

3.0" diameter, 4.25" bend radius, 5" legs, .079" wall tubing

3.5" diameter, 5.25" radius, .120" wall tubing

4.0" diameter, 6.0" bend radius, .120" wall tubing