You could probably estimate about 15 or 16 horsepower by using an electric fan and maybe another 15 horses by free flowing exhuast. Be careful though that straight 6 may like a little backpressure so i would put a flowmaster on it. Good Luck
I can tell you from experience that the stock 300 runs much much better with exhaust than without.My exhaust broke off about 3 feet from the manifold and it ran like crap until I got it hooked up again.
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