400whp from a NA 3.7 liter would require like 125hp per liter at the crank (rough estimate). Think about that. That's Ferrari 458/ Porsche gt3 RS 4.0 type of efficiency...aka the biggest non FI hp per liter cars out there from any manufacturer. You'd be looking at alot of work and very high rev's. I'd say at least 9-9500 rpm. The higher revs alone would require alot of work, let alone making the engine breathe the way it should at 9500 rpm. Is it possible? sure, but it'll cost ya.
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