I've no idea... I can't actually remember when I did the retro fit on my 4.2 how i self calibrated it.
I think I actually parked behind a car in a car park and used that to zero the basic settings and it was absolutely spot on...
But I'm guessing I must need to lower the radar on the W12 because it picks up larger vehicles but not cars..
And the 4.2 picked up motorcycles and all sorts
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