Does an increase in airflow (intake or exhaust runner) move peak torque up or down the RPM band?

greymouser7 said

Does an increase in airflow (intake or exhaust runner) move peak torque up or down the RPM band?
like Oldiron440 says.
plus if you mix additional fuel with that additional air, then the quantity of torque goes up, and by definition the power. But as to rpm,the peaks won't change much;unless you supercharge it.

Or is the torque band strictly dictated by engine displacement and camshaft?
And to some degree; cylinder pressure/compression ratio

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Also unless the engine is airflow choked early, there is a fairly stable relationship between the peaks of about 1600 to 1500rpm,depending on the LSA. So if the powerpeak occurs at 5500, the torque peak is likely to occur at around 4000. Whatever transmission you use, it sorta needs to work in that range, plus say 300rpm at the top; so 1800rpm.
This is why 4 gears used to be faster,cuz the powerband requirement was just about 1600/1700 when shifting at 5800. Whereas the autos drop 2300/2400rpm on the 1-2, and back up to 1800 on the 2-3. So for a streeter, that never/rarely gets into third gear, they sometimes/usually need a different cam LSa.
Why so vague? Well a hi-compression 360/727, with a 2800tc,and 3.91s is likely gonna burn all the way thru first and a good way thru second so LSA is not that important; whereas a stock smogger-teen with a 904 and 2.76s will probably not even chirp the tires and gets a full 2000rpm penalty shifting at 5000. That 318engine is gonna want a wide LSA to cover both ends of the working rpm band.