Intakes - show us it can at least outperform a K&N panel filter on the OEM airbox. Who cares if you can outflow a paper filter element on a totally stock set up.
Exhaust - Show us head-to-head comparisons with other aftermarket CBE's or TP's, not just a comparison with the OEM set up. You can easily find folks who will have other exhausts on their car already who will probably be thrilled to assist you in testing for a discount or free part.
Actually, just showing it will outperform the OEM nismo exhaust (bolted to a Non-Nismo Z that is) or the the S-tune would be useful info.
For LTH's, show us it can outperform a set of test pipes, which can be had at a fraction of the cost.
Wheels - Tell me the weight. If I don't know the weight, all I can base my decision on is bling factor. A lot of guys want to know this simple piece of info that is rarely ever listed.
Would also be helpful to know the range of tire widths that will fit.
For those of you who are already good enough to prodvide this info and make these sorts of comparions on independent dynos,
THANK YOU 
Hopefully other ambitious developers in the aftermarket will follow suit.