Ok ii guess ii think ii kno what he's saying. Because the shape of the head of the pipe. Its designed to get more air to flow creating more power as to the a normal end pipe. Air would try to cram all the air at once which makes less effiecient than the stacks. In theory and design it looks good. But idk if its gonna make much different. I give it a point for being creative tho. My friend had it on his ferio
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