I'm Back! '90 GTUs

[infernosg]

If you're not going to track your car the N/A transmission with Miata gears will probably be fine. ITS cars spend a lot of time at high engine speeds so even with less power they're putting more stress on the transmission. You could always look into a transmission cooler if you're still concerned. In my opinion it's still less expensive and confusing than having to deal with a turbo transmission in an otherwise N/A car.