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ORIGINAL: JD1969
if you ever look into an old school glass pack you will see why, they have little ridges that disrupt the airflow, a muffler such as a Dynomax Bullet and the ones you mentioned will not have any ridges.
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Ridges will disrupt airflow, but they are necessary to expose pressure wave to deadening material. You can remove ridges disruption will be less, but sound deadening will be lower. A glasspack and Dynomax Bullet work on the same principal, they deaden the sound.
A muffler cancels the sound. A pressure wave of opposite shape is thrown at the wave coming into the muffler, and sound is canceled.
I don't doubt you're racing, but apperently you don't know the underlaying theory behind a lot of aspects of automobile technology.