Since I sold my Supra I usually just lurk here but. I was on the don't need a BOV side.
Until recently My FD had a GT4088 Turbo without a BOV. Started to have compression issue and found both rotarys were low on compression. When it went to be rebuilt the turbo was inspected an there was a large amount of play in the shaft. It was possible to move the compressor wheel about 5mm back and forth in the housing so the wheel was hitting the housing.
Once the turbo was off and the housing removed both compressor wheel was missing about 1mm of metal and the housing had 1/2mm of metal missing. There were tiny shards of metal in the intercooler and pipes all the way to the throttle. So as the engine had only done 4500 miles since it was rebuilt it appears as if the compression had been lost due to the sharks getting into the engine
The Compressor wheel had unscrewed itself, I was running 1.4Bar and the only way for it to unscrew would be compressor surge.
So now I'm in the need a BOV camp