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Interesting discussion. I would guess that it is very possible that eliminating the hydraulic steering pump would free up some resistance. thus increasing flywheel output. I would wager that GM simply did not retest the engine under S.A.E. criteria, thus did not change the number.
The NPP exhaust could be the same story, as I believe it was introduced on the Corvette prior to the Camaro. I'm not sure if this exhausts changes the catalytic converter set up or not. The ability of exhaust to increase engine horsepower relies upon it's ability to increase scavaging of intake air. If this exhaust allows the exiting exhaust air to pull in more intake air during valve overlap, there's your increase. However, if there is a difference between the Corvette exhaust system, including cats, this scavanging effect may not be as much in the Camaro, hence no advertised HP increase?
Just some thoughts based upon my current understanding, and as always, I reserve the right to be wrong.
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