Open exhaust vs Dynomax Exhaust mufflers sound level difference BigBlockMopar 6 years ago Dynomax Exhaust Mufflers Sound Level difference vs Open tube exhaust Just wanted to share a simple clip I made showing the difference in sound a pair of Dynomax 17748 exhaust mufflers make compared to a dual open tube exhaust system… Share this: New Exhaustsystem – Dougs Headers, X-pipe and Borla Pro-XS mufflersDateOctober 3, 2016In relation to1973 Dodge DartDodge Dart DynoDay #3DateAugust 30, 2017In relation to1973 Dodge DartDodge Dart – DynoDay #4DateSeptember 14, 2018In relation to1973 Dodge Dart