I believe it has happened twice:

1. Volvo 142 valve springs and

2. Rear hub/disc conversion on the GM Quad 4 cars.

The others as Greg mentioned were shot down.

Seems like a lot of 944 guys do fine --- what are they doing? Loading the suspension differently?
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And no one has yet been able to explain how/why/when this came about. Seems there's no documentation on it in Topeka, just what's in the ITCS.