Does anyone know if a dual-inlet, dual-outlet catalytic converter keeps the exhaust streams separate? Or do they get mushed together in the converter?

All mixed together inside. !

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1990 300CE. Garage kept all its life. Looks & Runs Like New. Everything works. White w/Palomino int. Pioneer 12 CD player in the boot. 17" Enkei LX-F Chrome wheels w/Falken Azenis ST-115 225-45 tires. Tinted windows. Black sports grill w/Euro clear front lamps.

Thanks mr300cd! I tried to get this answer from magnaflow with no help.
Benzworld went to outer space with the question... no help...
A random muffler guy in LA is the only answer I got, and he wasn't 100%
sure but said he thought that they were not separate.
Greatly appreciated...