ITB's = 0 low end power and 100% tope end power.
in other words on a gts there will be zero get up and go below 6K
anything after that and its all gravy, trick would be to see if you could convert to speed density, or find a way to incorporate the maf with some kind of air box.
there was a member on n c org who is willing to do it just needs someone to pay for materials.
btw i think little rocket spider from there is going to have them put on his car=hes a hp freak also, and running out of mods is bad