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In response to your question about the inlet and its importance, think of it this way, you can only move as much air as you can get through the most restrictive part of the intake side of the engine. If your engine is mostly stock (maf TB inlet plenum etc) then the inlet of the blower isn't that big of a deal because the above mention restrictions are before it, but as you upgrade and get closer and closer to the outlet of the blower the inlet will become a restriction (and a big one at that) If you can, have it welded and ported, but if not just open it up as big as possible.
Phil