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Just so there is no perpetuated mis-information, the modification of the stock coupler to tight fitting bushings will only offer one axis of freedom in the coupler - so this is not a like-for-like alternative to the other choices.
The Porsche OE design coupler - with the deliberate built-in clearances, the Stomski unit and the WEVO PSJ, all offer 2 axis of freedom, so the joint can articulate to accept a certain degree of misalignment between the drivetrain and the chassis.
As the drivetrain has the freedom to move on all axis relative to the chassis, there is a need for the 2 axis of freedom at the coupler, otherwise the drivetrain is attempting to swing the shift tube as an extension of itself on the one plane where freedom has been eliminated by the home made coupler modifications.
There are a lot of those out there, home made, short run productions etc, so they do work and will feel better than a stock coupler in worn out condition.
However, the option of using round hole bushes was avaiable to the Porsche factory engineers as well - but they elected to use slotted holes and clearance on the flanks of the bushes too, to allow for a the 2 axis of freedom - it is worth considering that when you decide to modify your OE coupling.
Regards
Hayden
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