The 'CHRA' is the TURBOCHARGER less the turbine housing and compressor housing. A CHRA can be a the quickest most efficient way to 'renew' the turbocharger to essentially NEW state. By assembling a new CHRA into your old end housings, your turbo can be up and running with 100% brand new internal parts in very little time. Renewing via a factory NEW Garrett CHRA is better than rebuilding from a reliability standpoint because EVERYTHING on the critical assembly of the turbocharger is new. All parts such as, bearing housing, bearings, seals, shaft, wheels, etc. are ALL NEW! There are no re-used components when buying a NEW Garrett CHRA. The new rotating assembly is factory assembled by the same process in the same factory that built the original unit to the same (high) standards. The NEW CHRA will also have its own P/N and with a NEW SERIAL as it did when the turbocharger was delivered new from the factory. Close definition