[lucittm]

Unless there is a lip on the outside (I don't see one) the seal should be able to be removed and replaced in-situ. I would use a tool that is commonly known as, get ready for it, a seal puller. It is a longish flat metal bar with two hooks on the end, one of which usually fits into the metal rim of the seal (arond the circumference of the shaft) and brings it out one side at a time. If the seal is deep. you have to work at it for awhile. A shallow seal, like the rear main seal can be pulled out at an angle. I don't think Porsche would have designed a transmission that required full dis-assembly to replace a wear part like the input seal. I replaced mine a few years ago, not fun, but not impossible either.

Mark