attaches to a bulge and changes direction while attached to the bulge and b flow along the sideways widening areas of the duct and transitioning into a downward half vortex or half cork screw the result of the three branches of flow with gradual change of direction of flow rather than one u201c hit the wall u201d change of direction is an even and controlled change in direction yet still within a very confined space as dictated by the narrow confines of an engine compartment the problem of flow separation which occurs at the inner diameter sharp bend of the conventional transition segments as shown in fig2 through 6 is overcome in a simple reliable and eloquent way which does not impede flow or cause a significant pressure drop in accordance with the exemplary embodiment described herein finally the widening 80 of the transition section as seen more clearly in fig9 a and 9b maintains the flow cross sectional area preventing pressure drop this widening also tends to stabilize flow and reduce pre swirl a widening in this area is not a space problem in engine compartments since the area diameter allowed for the direction changing segment is generally the same as the compressor housing diameter preferably the curvature of u201c bulge u201d of the inside of the bend 81 x y axis has a radius from 0 5 to 2 0 more preferably from 0 7 to 1 2 times the diameter of the duct outlet 72 in comparison in the elbows shown in fig2 3 4 6 the radius of the sharp inside bend is approximately 0 1 times.