I have a 1.8 drop in. But soon I'll have alot of money and all I ever do on my free time is work on my car or research. I think I'm going to super charge it while it's a street car. After I buy a truck the Miata will be garagged and tracked. But when I make it into a track car idk what is a great lasting swap or conversion. And a six speed tranny will go onto a 1.8? It doesn't matter what year? I've heard that you have to cut into the body as well if you want a 13b. I don't want to ls1 or ls3 it bc I'd still like to work on my car you know and keep that Miata look instead of cutting holes infront of the rear tires for the exhaust I just don't like the way it looks. Just me