fabrication is when you use parts fabricated by denter ustad gee
modification is change in anything from the stock/genuine form, weather performance mods, visual mods or audio/entertainment system modification.
I think he just wants to look fast and maybe stage one performance mods, but that too not for performance but more of a visual satisfaction e.g. a Cold Air Intake installed at a place where it can get suck only hot air, it just have to look cool when he pops the hood.