The removal of the booster was under Ben's advice, and it's just one less thing to go wrong. If a one way valvle fails, your assisted bedal can turn into a 16psi pedal stopper.
The ABS is a commo unit (Bosh), the R32 gtr abs is bad enough, i can't imagine what the gtst one is like. i've seen alot of people mount them on the passengers side, which i thought is pretty dumb, considering the piping hot exhaust runs right under it (which is where the lines would go with a nav in the car)