Can't say much for the first endurance race, but I did win the last endurance race with a Accura NSX totally sup'd. I never did pit, ran the tires red from lap 7-100 and it worked just fine with T5 raceing tires with the car totally slammed.
I won 200k and the F090/S F1 car which I started wining other enduro races with.
I'm sure my sup'd Miata would have done just as good.