i believe you can have it in SD while the maf is plugged in, it just bypasses it; but will still do funky things when messed with. i can’t remember whether i said it is or will be in SD, it was a while ago, when i built my boost engine, and didn’t have the boost yet. regardless, i just remember the car almost dying in the middle of the 7 corners, and chugging the whole way home.