Every once counts when your doing a drag car I don't care what you say and yes the ac pump and smog pump do lower your hp not much but yes they do
My daily driver 4-door sedan is probably faster than most "drag" fox Mustangs these days.
For the most part, most of the fox 5.0's on these forums are either daily driven, or weekend cars. Very few guys are making pure drag racing cars, but those that do usually know what they are doing.
Being on the forums since early 2000's, most often the result of arbitrarily yanking stuff off a Fox Mustang is a poorly running car. So yes, yanking the smog pump and A/C off might save you 0.3HP, but is it really worth it when the car runs like crap?
yanking the charcoal box off does what exactly? Saves you 1/4 pound and makes the engine bay look cleaner? But now your car smells like raw fuel when you drive around and you run the risk of an explosion if the vapors build up. But all that's worth it for 0.05 second gains in the quarter mile right?