What is this turbo good for?

Smaller gas motors, like 2.3l to 3.0L. I know the older 2000ish Holsets off the Cummings were a popular swap for the 2.3 Turbo Ford guys. You have to remember that diesels don't turn the rpm's a gas engine does, so they need a fast spooling turbo (i.e. small) turbo. It would be a fun turbo on a slant 6.

I will say it also matter if its off a manual or auto truck, last I knew they were different.