[Overdrive]

I can't see how that would help at all, honestly. Personally, I'm with mikefocke, who is a good voice of logic, reason, and experience when you need it. If you don't want to do it right now, just check/replace it when you do a clutch job. If you're worried about it, have the retrofit done and have some peace of mind so that you can drive your car without worrying about the IMS (this is what I did). The up-front cost now isn't as bad as the cost of a new engine. Maintain the car well and you should be fine either way. If the shaft is going to fail, it's going to happen. In the meantime, don't let worrying about it stop you from enjoying the car you purchased.