I'll do some more research. I wanted to only include turbos that are flanged for our cars (preferably direct bolt-on or a kit), so if those match the bill I'll add them.
In regard to the SR50, APS doesn't list it on their website so I assumed it is discontinued. Have any idea?
I think the SR50 was discontinued but I think there would be value to include both non-subaru flanged designs and some of the discontinued turbos for two reasons. They provide benchmarks against performance achieved on other platforms and some folks will be looking to upgrade from or too these turbos and would like to know where they fit in the grand scheme of things.
That is why I included the T72 and T60-1 etc. In my list as many of the other platforms had experience using these turbos and they had become something of a standard reference point. For example the T3/T4 50 trim is an old design but still is a good economical upgrade for someone who wants to go that route if they get a super deal on one, or already have one laying around from another project.
Perhaps a second listing of the obsolete and standard flange designs for reference.