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make this all one operation on the CNC. You could also use a corner rounding endmill on the inside of the holes where you welded in your pics. By using a corner rounding endmill you can create a smoother track for the air to flow into the engine. It looks really good I have been working on a plenum design myself but its months out from making a product.

"Do you guys put the key in "balls down", or up?" -BobbyT 10:28:19 03/06/09 
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