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Depends on how much money you want to waste on a project like this. Turbo charger or supercharger can more than double the hp .... add nitrous oxide and add another 100-250 hp.. but you better beef up all the rest of the motor before you try to make a 900 HP V6, which by the way wont be very streetable or reliable or economical or practical for anything except the drag strip.

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14y ago
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Q: How much horsepower can a modified 4.3L v6 make?
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