The Speedtop and Skytop concepts are believed to be based on the current BMW 8 Series, and feature the same 460kW/750Nm 4.4-litre twin-turbo V8 as the M8 Competition, the "most-powerful" non ...

They have a pretty extensive list of aftermarket parts available for all sorts of Miatas and their turbo kits have proven to be quite a reliable way to extract more power from these cars.