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driving with the pump disabled is not a real simulation of manual steering. with a disabled pump you have to push the fluid through the pump - not so with a manual rack. i have a professionally depowered rack but haven't had the chance to install it yet. i have spoken w folks with 996's who are running manual steering (LS conversions) and say it is not an issue (slightly different weight distribution, however). probably not a lot of weight loss (10 lbs?) but also note less parasitic drag on the engine. with a track car however, note that you'll most likely have wider front tires that will increase steering effort, as well as the possibility of your steering biting back in an off.
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