Good-Win Racing has long specialized in 2.5 conversions for the NC Generation Miata. We raced and set track records in the first serious 2.5 liter fully caged NC (Project NC LIGHT detailed in our forum) and later developed our dual purpose street/autocross/track "Project Blue" shown above.. The reason to use the 2.5 is easy to understand, it's a bigger Mazda factory motor that is easily installed into the NC Generation Miata for a reliable normally aspirated 200 hp Miata when trimmed with all our 2.5 goodies below. Or add boost and make 300 HP and more! Our Project BLUE shown above with our big 1.8 Inch Header and a custom built 2.5 liter running on E85 and making over 220 hp at the wheels! We do these installs here...and we sell you the parts below to help YOU get the most from your 2.5 conversions. Note we do cannot do conversions on California highway registered vehicles.