Most of the smaller turbos are more cost effective to just replace the
cartridge. Usually half to 2/3 the cost of a new turbo, no worries about it
being done right or balanced properly. Of course if you are still using one
of the original AAz turbos, there are upgrade options as well, although
adapting may be required. The Garrett GT1548 and GT2052 are two I have used
with great success.