....if my advice was neither sensible nor unbiased.
It just seems to me, that if you are going to take the time and effort to drop the transmission and replace the IMS, it's not THAT much more money to install the permanent solution instead of a temporary one.
Why would you choose another roller bearing, when there is a replacement out there that uses a plain bearing that floats on oil with no balls or rollers to fail?
The major cost is the labor, not the parts.
You can charge more for the car and not lose any money. As more and more young people buy up these old Boxster and troll these forums for information, there will be a growing market for cars with the "Solution" as folks will want to invest in a car they don't have to worry about.
As far as me being biased, well, yeah, everybody is.
I just don't understand how anyone with any sense of how machinery works would replace one failure prone roller bearing with another one when there is a plain bearing option. And another benefit of the "Solution" is the spin-on oil filter adapter that goes with it for better oil filtration and easier service, and elimination of the possible failure of the OEM drain back system.
I'll shut up now and promise to no longer contribute to these threads.
Good luck.
And Miata's ARE awesome, I had one for 22 years before buying the Boxster two years ago.