This is just one more example of how most audio enthusiasts (even casual ones) overpaid for their WRX. Had Subaru made the HU just slightly better, many of us could have lived with the bleh design in trade for the long list of favorable features- BTA, BT phone, integrated SWCs, hideaway USB integration, aux-in...
Instead, we all had to rush out and yank the stock HU because between the native EQ curve in the radio, poor amplifier section, file limit on USB, etc., the OEM HU was a weak spot in the audio chain.
I STILL don't understand why car manufacturers don't just add RCA outputs. Even 1 set of 2V RCA outs would satisfy most people ("I just want to add a subwoofer.") and woudl make expandability in stages much easier.
With all of the other useless crap that the masses pay for in a car, the extra couple of bucks would be a joke. People pay for lots of user interface technology that they don't want/need...how about some output upgrades?!?