I have been trying to order the PVHGonG Turbo and Short Stem for over a year now with no luck.
That why I just have the Stock Straight Tubes.
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We're just following the general sentiment that the PVHEGonG works better than the standard GonG, but have no experience of either one. In researching the subject on FC, it was noted that some folks with access to both preferred the standard. We plan to get one when the no carb version becomes available again and perhaps a non turbo PVHE version as well.
The continued supply problems PV has with their solo GonGs and stems would seem to afford an opportunity for some enterprising glass worker to provide alternative optimized versions.