i think it really dpends on your motor. the banshee is a 2 cyl and while one cyl is on tyhe compression stroke the other cyl is on the intake stroke (kinda), alowwing all the air to go into one cyl, bypassing th eother. if it were on a 1 cyl like almost any other 2 stroke quad, engine the airflow would have to stop and start and stop and so on...a continual BOV might be able to be used to bleed off the boost when the reed valves are closed...interesting tho...
i always had a fleeting dream of turboing my 250 suzuki, but never really looked into it. the banshees alreay had a tight powerband, esp. with toomeys and mikuni carbs, i cant imagine what it would be like when it was boosted.