It's called "The Stinger" and it's filled with more than 200 names. Those names honor all the living participants of the race.
Spokesman Greg Johnson said getting those signatures is upping the cars value, but the company isn't going to hold on to the collectible, it's doing this for charity.
Johnson said, "Once we have all the signatures we think we can get, Window World is going to auction the car off and whatever we get for it is going to donated to St. Jude's."
Johnson said the car has an estimated value of more than $1 million.