When I raced with MTS we had a muffler rule for all nights. Going back to pavement racing, I havent seen one night were they tell us to run mufflers. I remember in the early 2000s Berlin raceway telling sprintcar teams to quiet down or load up. I just got a set of Borla mufflers for my car even though its not a rule.
Nick Landon
Feather Ruffler Engineering
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