how do i redirect the bov back into the turbo system to keep it silent. i searched but no luck

 

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get a bov that has the option to recirculate and then route it back into the air intake before the turbo

 

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All Greddy valves and the HKS SSBOV can use adaptors to recirculate, finding these for sale can be difficult.

On my Greddy type RS I used the straight pipe screw in insert and added a small K&N to the end and it made it MUCH quieter. As a bonus it filters the air that gets sucked in through the BOV while cruising.