There was no R9 and no "still born" R9 project. The designation was never used, for other corporate reasons.
Here is what is on the record in regard to this topic:
The idea to develop a diesel sports car for the 24 Hours of Le Mans had already emerged in 2002 with the internal project name R10. The Le Mans V12 TDI ran for the first time on the test bed in July 2005.
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