I hate that. Why would they care about how it's titled. To them it should be just a modified fiero. Or if they ask you next time just tell them it's a real lambo. I thought all they tested was if the car had functioning turn signals, headlights, brake lights, and no cracks in the windshield and if your state requires a smog test.
If you continue to have problems you could offer them a dollar on the low low and say "maybe George might be able to convince you?"
If that doesn't work you can take your Honda up there and get your sticker and then remove it and apply it to your lambo. Of course this is illegal too. Good luck.