Yes that sounds like it is the documentary I saw
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Ilmor is doing engine software. Engines are still built by TMG. See below quote from Makinen himself.
Engine work for the Yaris is completed by TMG in Cologne, but Makinen admitted Ilmor had begun to supply some software solutions.
TGR has built 12 WRC so far.
-8 for rallying
-4 test cars