Wouldn't you think the area inside the pressurized intake tubing woud determine the flow needed rather than the turbo itself? In other words with stock intake stock recircs are ok but with 2.5" tubing stepping up to a recirc'ed Tial bov would be beneficial? I have no idea how much more a tial unit flows vs stock valve but i assume more. Then again as im writing my Tial recircs blow back into about the same size hose as the stock recircs... so no benefit lol To the origina post; a MAF/MAS based car must always be recirc'd to run right.