they have inline 4cylinders. the new gen makes 176hp the second gen makes 140hp and the first gen depending on 1.8 or 1.6l makes between 110-140.hp.

people have swapped 13bt's into miata's but they dont come facoty with a rotary. the first gen's used to have a 5.0l mustang engine option, but it was a lil pricey and usually not worth it. its a great car evn with minor bolt on's and if you want something fun and RELIABLE go with a miata you can run them all day at an auto-x and than drive it the next day to work