You don't use the IP Catalog or it's predecessor the mega-wizard when using QSYS. You didn't say what your dev board is, but if was from a major vendor it would have come with example projects that use SRAM. You can start with that project as a baseline. If the project isn't for a much older Quartus version, you should be able to open it with Quartus 13.1. I'm a hobbyist who likes to try out example projects and add to them. I have several older versions of Quartus installed so I can work with older example projects. Sometimes I'm able to bring them up step by step to the latest Quartus version, sometimes not.
I have quartus 12.1 installed because it has both QSYS and the older SOPC builder. You may be able to open an older SOPC builder project with that version. You can then use it to convert the project to QSYS and see if it still works.