A Spec Miata is a Mazda MX-5 more commonly known as a Miata that is built into a racecar. The unique part about a spec Miata is that they are all built practically the same. There is a category of racing that is limited to only these spec Miatas. because they are all almost identical racecars, these races end up being closer and require more skill than just a fast car.
Mike "hey let's go racing soon"
Tim "sure! ill bring my spec Miata"
or
Mike "did you happen to catch the most recent spec Miata championship"?