Not Ranked
I gained nearly 20 horsepower when I changed the exhaust pipes on my old cobra. Also you haven't taken into account any of the parasitic loss in the movement of engine parts and I don't know if you have air conditioning or not, but the water pump alone takes some power as does anything attached to the engine. Remember, when they run them on an engine dyno, it is with open headers, no water pimps or anything else and the only loss is what is in the engine itself. On mine my flywheel horsepower was 530 and the RWHP was 390.
Ron
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