The Mazda Miata remains one of the most delightful sports cars money can buy. The current ND-generation, which has been on sale since 2015, holds the record for being the longest-running version of the MX-5. While Mazda is already working behind the scenes on the next-generation model, the existing ND has recently faced new regulatory challenges. Reports from Japan indicate that Mazda has had to make certain modifications to the Miata to ensure compliance with updated regulations in Japan and Europe.

The surprising issue? The Miata has been deemed too noisy.

According to Kuruma News in Japan, Mazda plans to reveal an updated version of the MX-5 before July, coinciding with Japan’s new vehicle noise standards coming into force. These standards align with the global UN Regulation No. 51 (R51-03), which will enter its Phase 3 next month. The updated rules will reduce permissible noise levels to between 68 and 72 decibels, depending on a car’s power-to-weight ratio. For context, Mazda had previously modified the ND’s intake system to meet the earlier phase of these regulations. In Phase 1, vehicles were allowed 72–75 dB, which dropped to 70–74 dB in Phase 2.

To meet the stricter Phase 3 limits, Mazda has developed a dual approach. The Miata will now feature a larger muffler, which should help lower exhaust noise. Interestingly, the muffler’s capacity, at 2.0 litres, exceeds that of the 1.5-litre engine used in certain markets. In addition, the car will be fitted with a new tyre package designed to produce less road noise. Together, these updates are expected to bring down in-cabin noise levels by about 2–3 decibels—a small number that actually represents a meaningful reduction, given that decibels are measured on a logarithmic scale.

Beyond noise reduction, Mazda has made a few other adjustments. The suspension setup has been revised, trading the previous combination of soft springs and firm dampers for a new setup with stiffer springs and softer dampers. Mazda will also debut a new trim called the Pure Sport model, which will come in Zinc Green Metallic paint, paired with a grey fabric roof and standard Bilstein dampers. This special edition will also feature Brembo brakes with silver calipers, hidden behind 16-inch black Rays alloy wheels. As seen in the official images, the refreshed Miata retains its charming, compact roadster appeal.

While the Miata isn’t considered excessively loud in the United States, the changes highlight how challenging it can be for automakers to adapt to evolving global regulations. Still, Mazda’s commitment to refining and preserving one of the most beloved sports cars on the road deserves recognition.