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An engine generally doubles its power for every atmosphere or 14.5 psi. The FA20 with free flowing exhaust can get you something like 225 on race gas. So you’d need 4 atmospheres of boost, or something like 60 psi to get to 900 hp. No engines run that much boost outside of drag racing and none of those run it very long between rebuilds. Go buy a Mustang or Camaro.
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