i ran a couple of days with the maf drawtorhough, then i changed to BT mode because i was out of space for the hose to recirculate the bov, and i felt in love with this mode, the only thing that we have to worry it´s not to maxout our maf but for that we need to pass over the 250whp that the stock maf handless and to get that hp we need more than 10psi and cams