In the case of the 603 Garrett turbo, I pressed a freeze plug into the ARV inlet. I left the ARV housing sealed and in place because the port to the compressor inlet was an odd shape to plug.

If your turbo has the same trim as a non-ARV 617 turbo, maybe you can swap compressor housings. I get the sense it won’t be that easy since the ARV turbo is positioned differently.

Sixto
98 E320s sedan and wagon