The Jackson Racing Supercharger offers heart-stopping acceleration and throttle response, and pulls hard all the way up through the RPM range. Our Supercharger gives you 40% more power as soon as you hit the throttle. The Jackson Racing Supercharger utilizes the same patented design Eaton uses for OEM manufacturers such as Ford, Pontiac, Buick and Mercedes and is smog legal in all 50-states. The vacuum bypass system remains closed when you need the power. When you are simply cruising, the bypass opens to reduce the load on the supercharger. The transition is smooth and seamless. The Jackson Racing Supercharger is maintenance free and backed by a 2 year, 100,000 mile limited warranty. Installation is straightforward and should take 6-8 hours. The products are extensively road and dyno tested. Jackson Racing's rigid quality and engineering standards ensure that all products will meet or exceed the performance claimed. 
On Miata's equipped with a factory strut tower brace, it will have to be permanently removed for Supercharger installation.
Miata's equipped with ABS will need our washer bottle relocation kit 902-490
04-05 Miata is not CARB approved.