how the SAE scale will affect the dyno at any elevation, you cannot just throw out a blanket statement like that. It will also skew sea level numbers as well, intercooler efficiency, turbo efficiency, water injection, blah blah blah, the scale was meant for NA.
Most seasoned Z owners know Arts numbers @ stage 5ish 15 psi Producing 351 rwhp is not out of the norm for those mods. That is what the basis of this thread was about proving your blanket statement wrong. That is real world proof as is the numerous dyno's I have witnessed.