The OEM turbo is finally showing some bushing wear after 18 years, two engines, 4 IPs and 168K miles. Wondering what is out there these days an improvement over the stock GM-8 unit. Not looking for huge numbers but 20 some odd years after the OE turbo was designed there has to be advancements in designs to benefit from.

Truck is:
-2000 K3500, 6.5TD/auto, CC, LB, SRW, 4x4, 4.10s, 265/75-16s
-engine was replaced in '04 with a Navistar blocked long block and has ~70K on it now.
-3" down pipe, 4" exhaust, remote FSD

Would like to get a manual wastegate so I can ditch the vacuum pump(original). A replacement GM-8 center section would most likely be the cheapest/easiest but I'd like something better.

The truck is used as a truck. Probably has a trailer hooked to it or a load in the box more times than not.

Thanks, Dan