The plenum and port entrances got a screwed up between the prototype and the copy when they made the Tomahawk manifolds. It's impossible to make ithe Tomahawk version right without welding. That doesn't mean it's a bad manifold. It just can't be a good manifold without a ton of work. The ported HSD manifold I posted a picture of is about as far as you can go without welding. At that point one has to decide if you'd be better off with a better manifold to begin with.
IMO a great benefit of the HSD style manifolds is hood clearance. They are the same height as a factory manifold. Also I always liked the way it looked.
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