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You could try some basic data logging with bimmerlink to track IAT, see if it's actually getting hot on track. You have a tune, so maybe they would be beneficial there.
I suggest the V4s because the springs are linear and a higher rate, I believe, than the V3s.
With the cats still on the car I worry about temperature in the rearward heads and cylinders, which is why I'd want to keep the temps as low as possible.
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