turbo works by exhuast gases via a specialized exhaust manifold...so no header
I think at that # of clicks on the odometer you need some engine maintenace before anything. Get it checked out see whats really wrong w/ it. Check the compression, get a leakdown test.
Like hondaten says, the h block is good to only a few turbo'd psi before it cracks (kinda like the b20b/z).
SO
If it were me Id just go w/ an na build. Just easier. Get some good cams, port the head and intake mani, match the exhaust ports.
Just get it running good right now though
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