How come horsepower tv gained a very small amount of hp off a 70mm TB on a 97 stang?

[96_4.6]

I know and I agree with the before you buy it does it make sense. I've always asked around from working on cars when I was very little(watching rather) on my dads barracuda to my cousins mustang buddies to people at the gym who work for gm it just makes sense the more air you force in the engine the more power it makes being told the engine is just one big air pump but the heads of course right so nuts to that I guess and 200 is alot I'm not talkin BBK you can get mac's for like 100 on the net with free ship so its not too bad but on the way to the gym the check engine light poped on so I dont know if I'm gonna do any mods just yet