I think you're confusing Wreck Pinata with Wreck RX-7 - IT7 came into being b/c SCCA couldn't get their heads out of their butts to realize that the RX-7s (ITA) were getting slaughtered by the fuel-infected cars. Wreck RX-7 came about first to give ITA RX-7 drivers a place to race where they wouldn't automatically be DFL.
I'm not sure why Wreck Pinata came about but on Saturday's race, a mildly prepared ITA Pinata won and the same car took 2nd on Sunday so it's certainly competitive.
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