8 bolt exhaust flange
 

Bought this truck with this 8 bolt flange already on. But I can't find any info on them or why it has it, turbo shows to be an ,HX35. 2001 dodge 3500. Any tips?
https://cimg5.ibsrv.net/gimg/www.die...f1125f3f8a.jpg
https://cimg7.ibsrv.net/gimg/www.die...c9be95f780.jpg
https://cimg8.ibsrv.net/gimg/www.die...345c520056.jpg