anyone on here have any experience using, or tuning an sti with an upgraded turbo with equal length headers?

i can't seem to stop myself from wanting to install my invidia headers and have it modified for an ext wg with my sz49.
but, i am curious if the supposed efects of aftermarket headers would be exaggerated more on a larger turbo setup.
i.e. increased lag, slow boost response , etc

interested only in equallength setups...
preferably 4-2-1 style like invidia, gpmotos, etc.