I just got this installed and thought I would post a pic. This is the newest race blow off valve from Vortech (bypass valve). It flows 1,362 CFM at 10.5 pounds of boost - WOW! It can only be used on Speed Density cars as their is no way to plumb the discharge air back into the inlet of the supercharger.
The inlet to the valve is 2.5" - bigger than the stock Mustang throttle body!
http://superstang.com/pics/bov.jpg