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To get your wai temps up you'll want to add a shroud of sorts. Right now you're getting air in the vacinity of your manifold. Try to pull air in such a way that, all the air gets drawn along very near to the manifold. Imagine you want to build a heat shield for your manifold, and then you take the air from the gap between.
Have you closed off the original inlet to the air box, so that all of your air comes through the wai? Is the intake air temp sensor still located in the air stream?
If you're successful in getting hotter air, I wouldn't trust tape to hold up, and would be curious about the source of the added plastic parts. That could be a reason to leave it as is. I built one that could add some good heat on the highway, but when I got stuck in some traffic it was too much- temps in the 150s and massive knock retard. So to go very far you'll want to have some sort of adjustability, or mix valve.
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