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I dought it absoulity necessary for performance to pass air around the throttle body.
We just need enough bypass somewhere to minimized the Turbo from slowing down between shifts.
If boost gage drops between shifts enough that we can watch it build up- or you feel the power building back for a one or one-two count, then the throttle bypass might help to a degree. (And again, it s a little insurance if the CBV fails.)
On my car the combo of the TBV and a higher flow aftermarket Compressor Bypass Valve plus a couple of other tricks gave me instant full boost between sport shifts so I did not have to wait for boost to build back up helping me maintain higher average HP. However I mostly attribute that to the higher flow CBV.
In should say I have never tried running without the TBV. Again, I was told to keep the TBV by a respected 930 tuner.
If it works well enough with out it that is all that matters.
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