Any Miata will win it with an oil change. I think I used a seond-gen Miata LS.
If you get T2s you will only need to pit once, right around lap 20. I think I did it on T4s and pitted every 10 laps. Just put in good smooth laps and you'll be fine! There is one car that will leave you at the beginning, but he pits at least 10 times in the race and he will end up dead last and a lap down.
Good luck!