there are 3 distinct advantages:
1-more air flow to the rear cylinder and head promoting increased cooling over the stock fan.
2-engine/seal/gasket longevity
3-a tad more cooler to ride in high temps which is a welcome relief to your right inner thigh.
NO mods needed to the part numbers you listed which are the inner and outer scoop assembly. you will need quantity 3 of part number AN1005.3FSS they are the 3 outer scoop to inner scoop attachment screws though some folks source them locally to save a few $. i just order them when ordering the scoop assemblies. less hassle.