Why 350 at 18psi? Is it impossible for you to go higher? I know that my stock turbo at 16psi will only make 260-270 crank hp; unless bigger turbos flow more air at lower psi, I don't see how you could make 350 on 18 psi...and thinking about it, the more air you flow, the higher the pressure - which means you really can't make 350 rwhp on 18 psi. Anyways, a pretty big T3/T04 would do it...for the manifold, go with South Florida Performance. You won't find a kit or package or anything, but their manifolds are beautiful.
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