any machine shop can do it however i got mine through powerplay (r31house) who have them costom made
power steer realistically doesnt remove dick all power from you engine.. aybe 1-3 kw
plus it makes it easier to steer
i think ausi power steer suffers from dodgy rack and seals which cause leaks
hr31 rqack leak cause of the amount of conections in the 4 wheel steer
s13 racks are a proven quantaty and are esy to exchange so are a god move
pete