Sorted out the front stage on the wagon today. Some decent CDT Eurosport 6" mids with custom spacers and a bit of trimming along with some Dynamat and now there's some reasonable midbass going on. I know queries come up all the time about what will fit in the doors of various WRX's so I tried to capture a few images that may be of some assistance to others. I didn't bother taking photos of running the extra wiring to accommodate the crossovers not being mounted in the doors, nor did I capture the process of trimming off the small plastic ring from the rear of the door trim. The spacers are constructed of one layer of 6mm mdf and two layers of 12mm mdf. They were bonded with cyanoacrylate glue (Zap-A-Gap) and painted with some flat black spray can paint. A couple other minor points are that the spacers had a little bead of silastic applied at the time of being finally mounted, foam tape could be used alternatively. And the four screws that hold the mid extend to grab into the metal of the door. The metal cut from the door itself was to allow clearance of the speaker terminals.
There is a more comprehensive set of photos here for the extra curious -
https://www.facebook.com/media/set/?...4318221&type=3