One of the advantages of going with stand-alone usually is the ability to use a MAP (plus MAT) sensor instead of a MAF. The MAP+MAT setup is better for so many reasons (a lot of them I'm not awake enough to remember). For one, you don't have to worry about the restriction/turbulance a MAF unit typically introduces. Secondly, you don't have to recirculate every little thing. You can let the BOV vent to atmosphere, and the crank case / valve cover (if you prefer), and X Y Z. I just know there are a bunch of other benefits, I just can't think of them right now.