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IIRC these were manufactured by Boysen (same company Alpina uses) for BMW, for countries that had limited availability of unleaded feul or no legislation requiring cats. There's a non-adaptive software program from BMW designed to work without O2 sensor and cats. Member BillieS38's car used to have this setup, and was quite surprised to find these under his car after repeatedly failing the annual emission test.

You might want to try if your top-speed limiter is programmed, because is it is missing that answers a long standing question. Serge's car had no limiter when running the non-cat program, while being limited when on the cat program.
 
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