I installed one of Ben's ball bearing short shifters and really like it. Seems to make shifts quicker and more precise..
The exact shifter that I have doesn't appear to be available but this looks like his current version -
https://www.uniwerksdesign.com/product/bens-porsche-996-986-short-shifter/
Photos of my install here (near the bottom of the page) -
https://rx19jones.wixsite.com/projectboxster/projectboxster2
Cheers - dj