Great feedback on your testing and giving my theories a try. Your methods are very methodical and makes sense. My gt28r hybrid twins are coming in from BNR next week, and will attempt to run in in stock ecu with piggyback EManage blue. I have an enlarged ebv bypass pipe and will be having the ebv iron collectors ported to help with pushing the prespool to a higher point.
If you are intending on using USDM twin turbos and are interested in the enlarged ebv pipe and aftermarket exhaust manifold that works for both usdm and jdm turbos, I recommend you contact Stu Hagen. You can pretty much