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My design allows for different length velocity stacks that screw on. The stacks that I will be using will actually sit on the floor of the plenum for turbo applications. With different velocity stack lengths that are interchangeable, one can tune a N/A car for hp and torque at specific rpm levels. It also helps the head porter so that he can easily take the stacks off and port match the runners with the heads. Unlike other company designs, the outside runners start out as oval to match the heads and flare out to a much larger round design that attach to the plenum to create a funnel effect for the air to travel into the cylinder heads. IMO my runner design works better than a straight oval or straight round design but that is only my oppinion. Actually I talked this over with a couple of fluid and thermal dynamic engineers. As far as I know, I'm the only one with a billet design- no welds here buddy. Everyone else uses welded sheet metal. It took my machinest 3 days to do the bottom piece. He said it would take another 1 or so to do the top piece. I wanted to get manifolds from other companies but they told me it would take 6-8 weeks at least. For me to make a replica it would only take less than one week in the cnc machine. And as long as I have the base program, I can make changes on the fly. If I wanted to I can design my fuel rails as part of my top piece cover and when the cover bolts down, it will also be bolting down the rails as well. This is my little pet project. Everything is based on theory but I am going to give it a try. I'm looking to do some R&D against a stock manifold and just see how it goes. It is ~3x the volume as the stock one and by using a 105 mm tb with 5" intake piping, it should flow alot of air through the top mount 91 mm turbos sitting on top of the hood.
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