I've been looking for a car to take rallycross-ing and I've got my eye on the early Celicas. According to edmunds and other various sites, the 1991 GT Hatch is about 150 lbs heavier than a 1990. Edmunds says the 90 GT hatch is 2696 lbs and the 91 is 2844 lbs. Does this seem accurate? What accounts for the difference?