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While in theory, a lighter wheel will provide more response in both turning and accel/decel but the reality is that the strength of the wheel tends to provide a larger difference.
I remember reading an article where Enkei took 2 sets of the exact same wheel and shaved as much weight they could off one set. The set with weight removed negatively impacted rigidity although they were about 4 pounds lighter per wheel. Then they tested each set back to back on track with exact same tires on the exact same car and the heavier wheels were repeatedly faster. In the test data, the lighter wheels had slightly faster top speeds on the straights but lost time in the corners to the tune of half a second on a minute long lap. Enkei suggests this was due to improved steering feel and feedback to the driver with the stiffer wheels.
The take-away is that there are always compromises. At most, you are impacting performance by half a second per minute in a track situation. I'm a track rat so that is always a consideration for me but outside of that, I wouldn't worry about it and get what I think looks best within my budget.
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