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look at that pic I posted of a flowmaster exhaust. See those plates inside that protrude(key word) into the flow and force it to go around it? Those are baffles. A perforated steel sheet rolled into a tube is not a baffle, technically. There are no protrusions into the flow to cause turbulence and slow it down. In the limit, the tiny indentations will cause a very small amount of drag, but NOTHING(and I mean ORDERS of magnitude less) like the baffles you are thinking of in a OEM muffler. Some lesser mufflers have the openings for the sound to get to the absorbing material in the can in the inner steel tube made by simply using an NC punch to "dent in" small pieces leaving part of them attached(think "hanging chad"). This is much more drag that the GReddy design, but still superior to OEM. According to the dictionary a baffle is: "To impede the force or movement of", or "A usually static device that regulates the flow of a fluid or light" The perforations do not "impede", nor do they "regulate" as a conventional plate across the flow does in an OEM muffler.
Mike ------------------------------------------------------
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