The Stealth head was designed as a performance replacement for a stock head which it does a great job of. It can easily flow over 300 cfm with the valves it comes with after some port work. A 906 head can be ported to over 300cfm too but they start getting a little thin. A max wedge port opening isn’t a magic bullet to turn it into a TrickFlow or Indy head. We already have that area covered well.