Slant six in a Miata ? Why ???

No way I would put a slant in a Miata. The engine bay is just too short. There is some width, however. The popular V8 swap into them is an LS, but it still expensive even if you do the work yourself because the car HAS to be blown apart for some serious surgery. BUT, in the end you wind up with 400+ horsepower with the same fuel mileage (20 in town, 30 on the highway).

BUT, as the Miata is not a fast car, they are a blast to drive. The absolutely go wherever you point it, but you better not be taller than 5'10" or weigh more than 200 lbs. You WON'T fit. Yes, I owned one for about a year. A truly enjoyable car to drive.