nothing as far as upgrades, the 240 rack(non hicas) s13/s14 are great racks. as far as upgrading the power steering system, go with an oil cooler on the return line, a bigger reservoir to avoid overspill at high revs and when fully countered and a higher grade of oil, possibly something with a higher boiling point, as far as angle, get a set of inner/outer tireods off tein, they supply a washer that will give u a 1/4 turn more on each side and stiffer steering links for those harsh loads. Some people run steering quickners but that takes time to get used to so i wouldnt suggest it!:bigup:
for fast and temporary relief of power steering woes, many guys put a sock around the rservoir to absorb the overspill, or add a catch can on the powersteering reservoir, or just put a hicas reservoir and cap off the second return line, this will give you much more fluid capacity:bigup: