From what I've heard it's not worth it. Just cough up the $50, take it over the pits, and have done with it (assuming the car is otherwise legal).
Apparently a vehicle inspection is the only way to get a yellow sticker off a car regardless of whether the sticker was earned or not - at least, some old lady wrote in to Road Patrol saying a cop had pulled her over and given her a sticker for having 'window tinting too dark'. He didn't even take off his sunglasses to make this assessment. Despite this, she still had to take it over the pits (and did so, without changing anything, and passed). Moral of the story: The system is fckuked.