My take is that fbo means full bolt on, where you every avalible bolt on part that's out on the market for the platform. If it requires tearing down the eng ie cams, pistions, rods it not a "bolt on". A bolt on is something you should be able to remove and replace with out have to disassemble main components to install an item. Also the said bolt on must provide some type of car performance gain such as power or weight savings. FBO is used way to much on this platform but it goes the same from any other platform. Mainly due to everything being more opinions base. So if someone made a list saying this is what you have to have to be FBO then it cleans it up
And this is why the acronym should be changed or eliminated. How can you make a list of mods to be considered fully bolted when there are new mods all the time?
FBO now means sometime entirely different than FBO before there were upgraded turbos and inlets. That is why a suggested minimal term is used and build upward from there as more and more mods come out.