I've never understood the reasoning behind taking out the stock airbox, simply to make another one out of a Rubbermaid garbage bin...
I know you get a bigger filter and a slightly bigger "airbox", but I really don't see it being THAT much better than say a K&N drop in (in the SVT airbox), performance wise. It'll sound a lot better, but without major mods is the RU-3530's extra CFM's really necessary (over the E0998)?
I myself have the CF version of the GMK. I know it's not a perfect intake solution (with the bends before the MAF) but I feel as though it'll make the best numbers.
