First again up your recordsdata (simply in case)
Go to GTA V/x64w.rpf/dlcpacks/spupgrade/dlc.rpf/x64/ranges/gta5/autos/upgradevehicles.rpf
change the recordsdata. dukes_hi.yft – dukes.yft
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V2 added spoiler from alpha, bugcatcher from blade.
to vary the spoiler and / or bugcatcher Go to:
GTA V/x64w.rpf/dlcpacks/spupgrade/dlc.rpf/x64/ranges/spupgrade/vehiclemods/dukes_mods.rpf
and change dukes_wing_1.yft – dukes_blower_2.yft
Credit:
Gamoholik