Well that's true but not completely, if you have side exhaust you will hear the same for in the car and out of the car if it's loud, I know that for a fact from this guy's car that I know. But my car with the exhaust shooting out the back, you will hear more out side than inside. But I want it to be louder so I can hear it inside aswell as being loud outside. Similiar to the old fasion glass packs on old muscle cars... you were able to hear it in both senses...
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