I have been waiting months for an intake manifold, and getting jerked around. This has led to me doing research and I wanted to post what I have found.
Please look at this pic, which shows a $900 manifold (no powdercoat)
Now, here is a manifold that is also for an ecotec, but the log is facing the other direction. It cost $595. It is only oriented the other way because it is for a cobalt.
Here is a kit, which cost $450 as shown.
I removed my stock manifold, and have been taking measurements while waiting for my aluminum manifold to arrive. I have lost confidence in actually receiving my manifold, and am motivated to push forward anyway.
In regard to the second pic I posted ($595 manifold), I am thinking about calling this company and asking them to look into making a Slingshot manifold. I see no reason they can't easily orient the log any way they wish. It almost seems like it is possible that the person I ordered my manifold from doesn't actually make them. They could have done exactly what I am thinking of doing, and are charging hundreds more on top of that. I better not find that to be the case. Proverbial heads will roll.
In regard to the last pic, if I can't have one made, I am prepared to make one myself. I have been a machinist for 30 years, and I have full confidence I can make it happen with help from my co-workers. I have learned that the volume of the log needs to be equivalent to the volume of the engine at a minimum. I run a supercharger so I am sure I have a lot more math to do. If I take it so far as to make the manifold myself, I am also prepared to do what I have to. If I need to make more than one before I get it right, I will.