OK... maybe poor choice of words...how about individual opinion.
what one company calls a power band...or the way its measured may differ from another. Im not saying anyone is bad.
Simialier to camshaft companys, advertised measurements dont mean much cause they can make the advertised #s look in there favor.
You can have a grind from 2 cam companys with nearly identical specs...same centerlines, slight variation in duration/lift...but they claim to have very differant power bands.
as far as the Stealth intake, it may have good off idle numbers with a large cube engine...& great top end numbers with a small cube motor...but its give & take hard to have best of both.