I'm afraid of stuff getting sucked into my BOV, what should I do?
First of all, BOVs/DVs do not suck in air, they are always blowing out air, as long as the engine is running.
* There is a very small fraction of time, and by very small I mean infinitesimally so, where the BOV might suck in air between boosting and droping into vacuum. If you are concerned about this you can put a high flow filter element on the discharge side of the BOV to give you piece of mind, but it is really not necessary. This does not apply to radial valves R35 and R55