The "Banjo" bolts are the hollow bolts used on your fuel lines to attach them to the inj. pump, filter,ect. They are drilled to allow the fuel to flow thru them. Guys that BOMB heavyuse bolts with bigger passage drillings to flow more fuel to their mighty beasts.
The drilled air box is when they put holes around the stock air filter housing to allow more air flow BEFORE the filter.
You'll get the "lingo" as you read and post more. JUST don't be afraid to ask!!! Chris