nogoats Member Aug 30, 2014 #3 If the track doesn't specify, go with what your engine builder recommends.
mikelavite#72 Member Aug 30, 2014 #5 Are you racing competitively ? If so and you have a choice in the exhaust rules . try each engine with and without muffler and see what the engine likes
Are you racing competitively ? If so and you have a choice in the exhaust rules . try each engine with and without muffler and see what the engine likes