Try changing an engine number...
Inspector: I see you wrote is a 6 cylinder engine on here son
Me: Yep its an Rb20det
Inspector: Well, where are the spark plugs for me to count to ensure its got 6 cylinders
Me: Under that valley cover (points)
Inspector: Well, you better remove that so I can count them so I can sign it off as a 6 cylinder engine
Me: I cant, I need to remove all the pipe work and coil packs etc etc (didnt have anything in the car to do it anyway)
Inspector: Son, If I can see the spark plugs how am I to tell its a 6 cylinder
Me: Well via the engine number on the block, its an Rb20, Rb20's are a 2 litre 6 cylinder Nissan engine found in various Nissan imports and are generaly turbo charged
Inspector: You say its a 2 litre motor
Me: Yeah
Inspector: Well it must be a 4 cylinder engine then (started to change the paperwork)
Me: Told him to forget about it, and to consider a change of career as he was way too tallented to be doing this for the rest of his life... Then drove to a different DOT location and started again with much better sucess...