This is a court order on mufflers for our race track and not what I want but what I have to live with and that is why if you have mufflers you can use an equivalent as the rule states meaning that you car is at 85dba at 100 feet measured outside the track which is what the Extreme mufflers will get to if you have an equal it is fine and we do have a dosimeter (sound meter).

WINGLESS SPRINT CARS MUST USE Extreme Technologies Muffler 180 for Sprint cars or equivalent.

thanks