the question has plagued our community n00bs for several years now. well, i have the answer for you.
this is a muffler bearing:
FACT: a turbocharger reduces noise and therefore is technically a muffler
FACT: there are bearings in the CHRA. typically there is one for the compressor side and one for the exhaust side.
SO if we refer to the turbine as a muffler and there is a bearing on the exhaust side of the CHRA, then we have a muffler bearing.
as created by sqd, gt2871blubird, and prodrifter