I'm wanting to ditch my OLD low hanging headers, are these manifolds worth it?

318willrun said

you can get 2.5 head pipes from TTI for those manifolds. You can also get better headers that don't hang low, like Doug's.

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I am aware there is a bunch of stuff out there. Unfortunately living in Alaska and shipping an already "out of my budget" exhaust system here is a firm NO GO. I will end up taking the ole' Duster to a local reputable muffler shop for the new system. Just exploring the options. I guess I'm really wanting to know IF these manifolds would rob enough HP to make a difference over headers.