Both of my BRZ 2100.1D's do over their 2 ohm rating at just over 2 ohms. (box rise/ D1 coil sub) I have been running just one in the truck now for quite a while with 0 issues. I miss having them both in there.....once I get done moving, it will be going back in.
FIY, I have very good electrical in the truck so I am sure that helps quite a bit.