This is a hard question to answer because there are many different options available for the Miata. The base model and SE models come with ABS as standard equipment. The other models come with ABS as an option and you have to check the specifications of your particular car to see whether or not it has been factory installed. Installing an aftermarket system can be done at a great cost, but might not offer all of the same benefits that you would get from a factory-installed system. The ABS is a good safety feature for any kind of car. It can make driving in adverse conditions safer and easier to control. It is a good idea to find out whether or not your car has the ABS option before you buy it so that you know what you're getting. Then, if it comes with the option, you can have the system installed later on if you have the desire and money to do so.