Miata mufflers add fun and power. Click into the descriptions of the many Miata mufflers below for a lot more detail. Miata mufflers can add a lot of sound or just a little, the can size and internal design have a big impact on the final sound level. Those considering adding a Miata header need to understand that bigger pipes equal bigger noise levels and owners with a header on their Miata typically end up wanting one of the bigger muffler choices at the rear to control the final sound level. On the other hand, those with stock headers can often go with one of our more aggressive Miata mufflers at the back.