As Jake mentions, the weight issue isn't a valid argument when discussing ITR cars. There are already cars in ITR that weigh as much as the Pony cars would. Besides, ITC doesn't run with ITR anywhere that I am aware of except for the 13 Hour Charge of the Headlight Brigade enduro. And, even there, the ITR cars aren't the fastest cars running the race, so the ITC vs ITR argument doesn't hold water in that instance as there are faster cars to be concerned with than ITR.
If "the weight issue" were to be forced as an argument then it would setup an problem within ITR itself. We'd have to remove the light-weights from the ITR class, the Celica and Integra Type R, to make ITR consistent with "the weight issue". Celica is in the class at like 2300, about the weight of some C and B cars, while the BMW 330 (in class now), 300zx (in class now), and the proposed Pony Cars are all at about 3300 lbs.
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