if you want more power you need more fuel. the reason that turbos make power is becasue they force air in to your motor, there for allowing you to burn more fuel. thats were your power comes from. if your only going to run 4 psi and you want just a little more power then stock then you should look at cams, exhaust , intake and any other not forced induction performance upgrades. it will be less of a headache then going with a turbo.
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