The Delta IV Medium+ (5,4) (Delta 9450) is similar to the Medium+ (5,2), but uses four GEM-60s instead of two, enabling it to lift 6,882 kg to GTO.
This is a high quality, presubdivided model with most of the exterior components and details present. This model comes in four pieces, upper stage, CBC (Central Booster Core) GEM, and Engine.
Included with this model, is the RS-68 motor, detailed with a moderate level of detail, minus the various sensors and tubing to support the sensors, valves, or screws.
If you need the Delta IV+ (5,2) simply delete two of GEM boosters.
The mapping was baked with V-Ray under Global Illumination at a resolution of 4096x4096 pixels in size. There are three maps that will need to be assigned to the meshes in the scene, and are named according to the meshes.
One HDRI map is included with this model, and should be assigned to the V-Ray HDRI slot in the material editor.