Cutting the end out of the baffle makes it deeper and louder than just drilling holes. But really gives it more "crack", not as deep, when accelerating. Personally I wish I'd stopped at "drilling 4 1/2" holes" instead of the "full debaffle" on mine. The tone was deep enough and acceleration sounded more mellow. Ultimately I pick up a set of Cobra Dragsters (used) for $250 and not only like the sound, their isn't as much "popping" and they LOOK far better, IMHO.