Review on K&N Cold Air Intake Kit for 1990-1993 MAZDA Miata: Boost Horsepower with High Performance 57-5001 Kit - 50-State Legal by Adam Taylor

I bought this product with pretty low expectations after browsing the forums and reading long articles . Bolt on. However, once this part is fitted (which, if you have any idea, is simple and straightforward), there is a noticeable increase in displacement at high rpm, not overwhelming or "tinny" but a pleasant growl, in reference to the Performance gains are small but noticeable, especially in the top end. I would recommend this product to anyone looking for an inexpensive, high quality nozzle. In addition, aesthetically, it is a good addition to the engine compartment.