-2.5 is a good start. Take a look at the shoulders of the front tires to understand if you need more or less. You may need more depending on the overall roll stiffness of the car. If anyone can take photos of the car at max lat g head on to see if you have 0 camber or positive camber.
Since this sounds like a street car, expend the amount of effort that you have time to do.
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