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Gain 20hp or not lose it on the second and third run? I saw the video those guys put out trying to compare intercoolers, it was a terrible test

If your engine has a mass airflow sensor it will see any extra air and compensate. Same goes for wideband O2 sensors. If it is speed density that may be true. Or a carbureted engine. Headers probably won't change it enough to matter though. A lot of people say the car "runs rich" with headers...

Forged parts alone don't make any more power than cast

Those are different looking rods than the ones the AED dark horse teardown

Nobody said they were H beams or anything like that Those are Predator rods which is what they were always supposed to be, right?

You want replace the factory IC not put a fan on it

If you're not driving it for a while just unhook the battery from the car but leave it on the maintainer

Shifting, MT82D4 3-4

First thing to look at could be timing and knock. Maybe your fuel isn't as good as last time

Did you only do one run? Did you datalog it?

Not at all...

They are not running the factory tune

Has anyone removed both DH and GT cams and ran them through a cam checker to see what the difference is?

Yes

I wonder what that adapter flows that they used to hook up the dual TB's

Replied right after you quoted Can't find the video but didn't the S550 they had dyno at 570 with ported heads/cams/CJ?

You're looking at an old chart before they added more mods. That's back when they just did ported heads They are trying to show the difference heads made before they talk about cams

These cars cold starts make me cringe.

9.2 @ 155mph isn't an experience!?

@Junkyard Dog do the Whipple and just use SmoothBoost to effectively turn it off while you're doing your track stuff https://www.smoothbooststore.com/product-page/supercharger-boost-control-system-by-smoothboost-whipple-3-0-mustang and honestly you could do the same with a TurboXS electronic...