hi all, i've seen on some hi-powered apps they have a vented rocket cover (don't bother about talking about the PCV i know how that works)

like this (borrowed your pic Fatboyz let me know if you want me to remove)



Now can you guys out there let me know if there is any benefit in this?
Just that i noticed i am now picking up abit of blow-by on my car in my catch can and was thinking of doing soemthing like this if its gonna help