If you track then yes, an upgraded PS cooler would be a good idea (but certainly not mandatory). I changed mine to the Stillen since it was an easy swap, has about twice the cooling surface and a little more volume.
When refilling, fill the reservoir about 3/4 and have someone turn the wheel lock to lock a few times with the car running. Monitor the fluid level and top-off to about half-way full. The fluid expands a little with heat and sloshes around pretty good and since the cap doesn't seal that well you can get some overflow if it is too full.
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