In the two s14's we have running, this hasn't been a problem. On one, the oil pan was cut back to make room for the stock sway bar. With the addition of an oil cooler and filter relocation kit, the whole system holds 5 quarts. You could make a skid plate out of some heavier steel if you feel like it will get hit. The oil pan ends up between the front wheels which keeps it protected going over speed bumps and the like.
Keep it posted if you come up with a solution. I have looked into it a little, but the price tag goes up very quickly. lol
Watty