As a hobbyist custom car audio fabricator, let me say that making proper pods out of A-pillar panels is one tough mother to do correctly, and with a style that fits the vehicle while not blocking the driver's vision. Not to mention the issues with acoustic placement and reflections, as well as comb filtering effects, etc. etc.
BTW, this was almost a 12 year old post, so things may have changed since then!
Edit: Went to their site, https://shop.wickedcas.com/toyota---...?category_id=3
seems to get there. I have not acoustically auditioned these but my visual impression is that the tweeter and mid are too far apart from each other to be ideal. When considering the frequency range that the tweeter and mid will share at the acoustic crossover point (which is the amalgamation of several factors including electrical crossover point), the distance of a driver from another can affect sound in a way that could be hard to compensate for with DSP. What I'm saying here is that with few exceptions, the mid and tweeter should be as close together as reasonable so at the crossover point, there is less comb filtering (positive and negative interference patterns depending on the listening point and frequency.)
One thing I noticed about my FJ as soon as I got it is that the factory tweeter locations are darn near ideal on their own. The placement, angle, etc is all acoustically really close to perfect, even without DSP. If the pillars had a midrange installed at their bottom and angled in slightly (close to the factory tweeter location point), that could end up being a great starting point.
2012 Cavalry Blue - 3" Toytec BOSS 2.0 lift, JBA Control arms, Fuel Anza 17x8.5, Patagonia M/T 285/70-17, roof wrapped in Avery satin black vinyl, all work DIY for better or worse