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It is a larger plenum and increases the sound. I will be shooting them a email soon and see what power this brings.
So you have to buy the top and bottom half? The picture looks as if the plenum is using the stock bottom half, so the only way to increase plenum size, without getting insanely technical, is to have the plenum higher, though you run into a problem of having the hood in the way, and I for one am NOT going to put a hood scoop on an M5. I am not sure how you are going to increase the sound without taking away material, ie, to let sound OUT of the plenum.
 
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