I have seen the kits work just fine on customers cars.
I have also seen customers end up having bad luck with their turbonetics turbos out of the box.

I would personally piece a kit together runing a tial wastegate, blow off valve, precision intercooler & turbo. For a manifold anything which is free flowing would be ideal such as a equal length manifold. If your looking to stay on a budget w/ a/c a cast manifold such as the inline pro would be ideal.