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Well, the guy is wrong.
If you do not change the amount of air and fuel in the combustion chamber, and you don't touch the tune, then yes, the 426hp number is more or less "the number."
But adding a cold-air intake and swapping out the headers with something less restrictive will increase the efficiency of the combustion process and thusly increase the power capabilities of the motor.
And on top of that, re-tuning the computer to change any number of variables will also increase the power capabilities of the motor.
I would not consider your intake and exhaust manifold to be "parasitic losses" like he seems to think. Parasitic losses come from things attached to your motor that have absolutely nothing to do with the direct production of power. Examples of these would be the stuff attached to the front of the motor called the accessory drive (your alternator, a/c condenser, fuel pump, oil pump, etc.) and the stuff attached to the backside of your motor (your transmission and differential) called the drivetrain.
The stuff up front robs power from your motor because it creates a drag on the system. The stuff out back robs power from your motor because of efficiency losses. The drivetrain losses are something you generally just have to live with unless you want to spend some serious coin swapping big ticket items out (or tearing into those big ticket items to swap a gear here and there). And the stuff up front you can minimize with under drive pulleys if you want, but that will in turn cause a bit of stress on some parts if the pulley is sized way too small. An example of this would be not spinning the alternator fast enough to fully recharge the battery, or not spinning the oil pump fast enough to properly lubricate all parts of the engine.
But the intake, exhaust, and tuning are not part of the parasitic losses discussion because they can be tweaked and tuned all day long to force more power out of the motor. Not to mention you can go the forced induction or the nitrous route and completely alter the characteristics of the combustion process, thus increasing your motor's power output.
Okay, I just typed a whole bunch but have no idea what point I was trying to make anymore.
So...I hope that helps clear things up...maybe...
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