Cat c15 really a C16, what turbo should I get for it?

My 2 cents, I run a c-16 that I did a complete out of frame rebuild on, I put a full tilt manifold on using the arp stud kit. I didn’t use the 12 point nuts that they give you, instead just a 6 point hex head lock nut works better. I use a non waste gate BW turbo. Nothing crazy, it’s a 171698 turbine, a 175964 cartridge and a 175963 compressor. I got it from the turbo exchange in N Carolina. Make sure you get the billet wheel!!! It spools quick and I get 42 lbs of boost on a cold day, about 40 on reg days. That’s with a 600 hp tune in ecm. Everyday work truck, it’s perfect for me. Maybe you want more I don’t know. Good luck, hope this helped