Don't try to add ABS. It would be a ginormous pain in your ass. As for lockup, I was asking how your bias was affected. You should be able to lock up one end of the car before the other on pavement with average all season tires.
Luckily, since you can run your own brake lines, you don't need to add ABS. Just get the MC that matches your caliper setup (so stock RS) and run directly from A to B with an RS prop valve in the correct position. It's not part of the MC, it's the thing that appears to have no purpose on the passenger side shock tower, but has brake lines running to it.
Changing the booster will affect pedal feel but not anything about how they actually work. Basically the RS guys like to swap in an older, single stage booster over the newer 2 stage booster, but I would hold off on that until you have corrected your MC.
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FWD is the new AWD
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