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post #1 of (permalink) Old 03-10-2016 Thread Starter
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Where do HP numbers advertised by aftermarket websties come from?

Where do HP numbers advertised by aftermarket websties come from?

*This thread could go somewhere else, but "2011 - 2014 Mustang GT Tech" area was my best guess as the part in example is for a 2011-2014, but if there is a better area then please move it there. Thanks*

So just as the title asks where do aftermarket websties get the HP data they use from?

SPECIAL NOTE: I am in no way trying to bash AM or call them out. Just I use AM for my aftermarket needs and that is where I saw the below.

For example:
Boss 302 intake on AM
Ford Racing BOSS 302 Mustang Intake Manifold M-9424-M50BR (11-14 GT) - Free Shipping

AM claims on their site in the: "DESCRIPTION: Gain Up to 61 RWHP. Bolt on up to 61 RWHP and 43 ft-lb torque with the Ford Racing BOSS 302 Manifold. We Dyno tested this system in house on our stock 2011 GT with just a JLT cold air intake, so you can be confident you'll see real gains from this manifold. This manifold is the perfect starting point for your list of power mods - especially if you plan on going forced induction."

Now my question:
I find this odd as I own a 2013 Boss 302 and there are numerous other motor HP adding mods such as forged internals and etc that turn the 2013 GT with the Coyote into the 2013 Boss with the Roadrunner motor. Yet Ford advertises the 2013 GT at 420hp and the 2013 Boss at 444hp. So that is only a 24hp difference between the two... So I am very confused on how the Boss 302 intake sold on AM can bolt onto a 2013 GT and add 61 hp to it as that would be adding 37 more horsepower to the GT than it added on the factory built Boss motor...

Can someone help me understand?

Current Garage
(11.)2012 GT500 silver with red stripe, SVT performance package, and Recaro seats.
2018 Honda Civic Type R
Past Mustangs in order and color of text.
(1.)2000, (2.)2004, (3.)2006GT/Auto traded for (4.)2006GT/Manual, (5.)1996, (6.)2011GT, (7.)2003GT, (8.)2006GT, (9)2013 Boss 302, and (10.) 2002GT
(I have owned a few non Mustang cars over the years as well, but always try to have a Mustang with it or come quickly back to a Mustang!)
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