Per Wayne, the spin-on oil filter is an improvement over the factory

[masraum]

Interesting, Project No 2 from Wayne's 101 projects for your boxster book is changing the oil, and he says that the LN Eng spin on filter kit is an improvement over the stock setup.
https://www.pelicanparts.com/techarticles/Boxster_Tech/02-BASICS-Oil_Change/02-BASICS-Oil_Change.htm

Shown here is a full-flow spin-on oil filter adapter, allowing for use of a conventional spin-on oil filter, rather than requiring the use of expensive and inferior replacement cartridge-style filters. Manufactured by LN Engineering, this design makes changing your oil a somewhat simpler task. With the adapter, you no longer have to handle the filter cartridge, worry about contamination of the oil filter housing, or worry about cross threading the cheap plastic filter housing. The spin-on oil filter adapter also helps improve the longevity of your engine by providing full flow filtration, which means 100% of the oil gets filtered without having oil bypass the filter (an improvement over the factory design).

Not only do you have the bit above about the oil bypass, but he also says (in the book) that he has heard of a few instances where folks used cheap filters and the paper disintegrated and flowed into the motor which is something that you can mitigate by using quality filters.

[pwd72s]

^This, I believe. Back in the day, there was a spin off conversion offered for both 356 and 912. A buddy ran one on his '67 912...took the full sized Ford spin on. Dunno if they're still available. But since the early car enthusiasts and collectors are into "original" these days, maybe not.