The answer to the WHY is simple. So that you do not seriously hurt, maim, or disfigure yourself, the guy you are racing against, or some other innocent person/bystander when that puppy grenades from doing it in first gear!! I have seen one explode, the explosion was extremely violent. the car had a trans blanket, it contained the explosion. I have seen pictures [on here], of cars with shields, and the shields did not contain the explosion. there are replacement pieces to upgrade the trans, to help prevent those problems, and coupled with 2nd, or high gear burnouts, you should not have a problem with a 727 transmission.