These can work just fine when a quality one is used.
The most reliable one would be something that closes the valve on vacuum, and opens it when there's almost no vacuum so its automated.
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Creator of the GTR TT Conversion Kit, NA Record Holder (401WHP)
Ecutek Master Tuner (VQ37, VR30, VR38, B58, S55, S58)
BTWTuning
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