The 2025 EFRA Muffler List is now available for drivers in all IC racing categories.
The complete list of race legal mufflers can be found here (PDF)
Please note the list will be different every year. Some of the older mufflers have disappeared and more will follow. Remember that the responsibility on the noise production is up to the driver. Using one of the mufflers on the list does not mean that you are always within the limits. The noise production depends on a combination of various factors; motor/muffler/manifold/ins-box/gearing/performance and body (exhaust hole in the body).
