There is a ceramic bearing available as a replacement for the IMS.
My friend is a Porsche Specialist based here in Newcastle Upon Tyne.
Have a look. http://www.dandgmotorengineers.co.uk
That's probably the LN engineering unit we were on about earlier, I'm now deciding if I want to split the crank case or not. A guy on the Porsche forum has offered me the lend of all the special tools and if I get my bearing out I can send it to Hartech for some love. I dunno I'll wait until I get the head in the week and make some decisions once I've spoken to Hartech/Porsche today.