Polk speakers with hifonics amp?

[dbcky00]

Last year I replaced my speakers on my 04 wrx with Polk db521s 5.25" in the front with db401 4" in the rear running off my pioneer avic d3 head unit that's rated 50w x 4. I'm planning on replacing the front speakers with Polk mm5251 5.25" components that are 90w RMS at 2.7 ohms and wanted to run them and possibly the rear speakers which are 45w at 4 ohms off an amp. My brother has a hifonics zues zxi80.4 that he doesn't need anymore. It's rated at 160 x 4 at 2 ohms and 80 x 4 at 4 ohms and 320w x 2 mono bridged at 2 ohms I was wondering if I'd be able to run the fronts and rears together off the amp or if it would even be possible with this amp? Just want to figure out my options for an amp before I buy anything. Also would it be possible to run the components and a subwoofer bridged over the other channels and just keep running my rear speakers off the headunit. Can anyone help me I'm lost