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How many miles are on you car? I seriously doubt that it is the rod bearings. They make a VERY distinct sound when they let go (like a train wreck followed by a very poorly running engine). If it was, then it would already be too late and you would be looking at a full engine rebuild.
The most common problem that I have seen for vibration issues is the motor mounts. These can be changed by yourself, if you have the time. Plan on at least 3-4 days of downtime. It would also be a good idea to get the timing checked by a good mechanic that has experience with 944's. Sometimes the timing belt will slip a notch if it's loose.
You may also want to check the balance/alignment of the wheels. This could also cause some serious vibration.
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