My understanding is that Panoz's licensing agreement requires ALMS/ELMS to run the races to ACO specs. ALMS is not allowed to change any rules without approval of the ACO. Another car not allowed to race in ALMS (Petit Le Mans) was the Lola/Mazda of Dennis Spencer, again due to not receiving ACO homolagation.
There may be some grey area in rules application. The BMW received a smaller restrictor for Laguna Seca but not for Petit Le Mans (Petit being an automatic bid race). The ACO is who came up with the restrictor change, but maybe left Petit the same as other automatic bid races to keep that part of things stable. But I believe ALL cars that race in any ALMS/ELMS event have been homolagated by the ACO.
Bob
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