This is a Garrett replacement Center Housing Rotating Assembly (CHRA) for the GT4508R (aka GT45R) ball bearing turbo. It's a complete rotating unit that's made, assembled & fully balanced by Garrett. Ready to go out of the box. Comes with manufactures warranty. Used to replace the "Heart" of your turbo. Simply bolt on your housings & you're ready to go with a brand new fresh turbo.
This CHRA is a replacement for the following turbos:
742581-5004S
742581-4
757707-5
757707-6
757707-7
757707-8