I've had some issues finding specific images of the PAC module connected to the Eonon unit with canbus etc. So, I think its going to be a trick for me to figure it out given I've never installed a stereo in my life. I've probably sifted through 50 to 60 threads on forums/youtube videos etc. regarding the Eonon units and install, but none of them cover using a PAC and if the PAC itself needs to be modified, in detail. Mazdaspeed owners mostly just say to use it as it makes life easier (no splicing in RCAs) but I've read some people having to splice the stock amp remote wire and then others don't even mention it (say it just hooks right up). After receiving the new stereo and putting the harnesses next to each other, I cannot see how I'm not going to need to splice tons of wires to get the pack integrated correctly.
The eonon unit is plug and play with bose in the gen2s. You only need a PAC module if you're running the stock headunit and want to run aftermarket amps. Utilize the RCA outs on the eonon unit to add additional amps.