Get a 20b. I'm the only shop in my city that builds/rebuilds rotary's, and we address all issues the factory didnt. If you wanna keep that 13b (a.k.a 1.3 liters of furry) I can help lay out a plan to success. Everything from parts to specs.
My advice is to get an OMP adapter kit, premix your gas, NO synthetic, and check your oil cause they inject oil so you will go low. Other that enjoy that power band and sweet rotary sound