Each Spec MX-5 begins life as a road-going 3rd generation Mazda MX-5 Miata. The 3rd generation, often referred to by it's chassis code of "NC" is based on the 2006-2015 model years. Each vehicle is stripped of it's OEM interior, wiring harness and unnecessary components for racing. An FIA / SCCA style roll gage is then installed for maximum safety.

The Spec MX-5 race car is based on the NC-generation (2006-2015) Mazda MX-5. This is not the Spec Miata platform (which is based on NA and NB generation, 1990-2005 cars). Nor is it based on the current ND generation (2016-present) as is the MX-5 Cup car. The NC platform has been selected because a) it allows a tightly-controlled spec series, b) it allows relatively low-cost cars to be built and run and c) the platform is capable of high performance.

The Spec MX-5 race car uses the renowned Mazda MZR engine, with a Roush CNC cylinder head and Mahle pistons (all forged internals). This provides an affordable, tightly controlled & reliable engine package. With a racing weight of 2525 lb., the Spec MX-5 fits nicely in several club racing classes, specifically SCCA STL and NASA ST5, and many endurance classes. With its race suspension, including Penske single-adjustable shocks, Eibach springs and the Toyo RR race tires used in the series, Spec MX-5 cars are significantly faster than Spec Miatas and T4 NC racers, and just slightly slower than ND2 MX-5 Cup cars.