So you're only running one headlight? That puts you in SP, if the Miata mod is equivalent. But again; just go and have fun! TB and this put you in DSP, I think. In my region sometimes STS is faster than DSP. Sometimes DSP kills - it's all who has a good day and keeps mentally sharp. No matter where you race, you'll still have times from every class to lok at and compare, so don't sweat it.