You see they opened the door for all the mods allowed in GT and PROD when they started to allow cars classed and built to those specs to run in ITE for the second driver. The Genie is out of the bottle.
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That has never happened. The only incident I can think of closely related to that is an IT car with the allowable safety modifications permitted to run production, as is the Miata in question. An IT car could not run GT or vice versa. If I'm wrong, give me a valid example, not one like the above quoted.