Time to get the brakes on.
Fairly straight forward job but ran into a lot of issues with compatibility.
The Shockworks kit is made for the ZN6 86, but uses a different, larger rotor (40mm v 32~mm I think) and switches around the sides of the calipers (as Libs have trailing front calipers).
One thing I rather slowly came to learn was that the kit is directly compatible for the standard slider calipers, not the Brembos! It's somewhat surprising to me as I would assume most would upgrade from Brembos, but anyway. Thankfully since the hubs are all the same, it's a matter of finding the right bolts to match everything up. For anyone's reference in the future,
the bolts used on the tbSTI Brembos WILL NOT FIT this setup. What you will need are the standard M12x1.25 (fine) 30~mm bolts with crush washers. These can be bought brand new from Subaru (partsouq etc) for a few bucks each, or can easily be found on any standard non Brembo Lib. The bolts used for the Brembos are 50~mm M12x1.5 (coarse) with the same crush washers. The length is to accomodate for the tie bar (2nd image), which will be safely deleted upon install. The tie bar seems to only be a thing on 08 tbSTI Brembos, however I haven't checked on an 07. The tie bar is a PITA since you need to back the lower strut bolt off to remove it, so I'm happy to get rid of mine.
The adapter piece sits like this, where the Brembo caliper would normally sit. Since you'll be deleting the tie bar, you can just run the 2 x 30mm bolts straight through the hub. I would recommend using some thread locker for this just in case. You will need to bash out the dust shields as they will foul the disc and adapter. The adapter will foul by around a mm which can easily be bashed in, and the rest will need to be pushed back 1/2cm or so. The discs do not fit the dust shields otherwise, so this is necessary. Alternatively, you can remove them too.
From here, things get very straight forward. Take a break to admire the massive discs...
Throw the discs on (make sure they're on the correct way as they are directional), then the caliper then fits over the adapter bracket with the provided bolts. These are 10mm hex drive bolts.
As far as hardware goes, you're basically done. Now it's a matter of getting the brake lines on and simply bleeding the calipers. The banjo bolts are provided with the brakes and look to be exactly the same as the Brembos. Absolutely nothing different from any other caliper.
One thing that is annoying me is the hard mounted clip on the stock STI braided lines. At the moment they're zip tied on relatively snug, but I'm not at all happy with it being able to rub on the strut. Just something to note if you have the standard lines installed. Otherwise, everything else should all work together.
Early impressions are that the street pad provided is absolutely bonkers amazing, as far as a dailyable pad goes. Initial bite is out of this world and it gives you a hell of a lot of confidence compared to the Brembos (albeit with a much less streetable pad). I can't at all quantify this but the outright clamping feel of the calipers is crazy - I can't describe it well but it really does feel like the caliper grabs a lot harder. I'd guess this is due to the pad compound, having full pads, and the caliper hardware + fresh fluid. It is really something to be experienced and is hard to explain!
And of course this means the 2.5i gets the Brembos.