Could you post a link to the Birds and ACS kits? I wonder what kind of dampers they're using.
I don't have experience with any of the kits you're looking at but the BMW Performance Suspension, based on reviews is almost impossible to go wrong with - especially for a street driven car.
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2024 BMW M3 Sedan Frozen Pure Grey II/Fjord Blue, 6MT
Past: 2021 Z4 M40i Frozen Grey II/Black Alcantara | 2017 F30 340i Mineral Gray/Coral Red, 6MT | 2011 E92 335i Le Mans Blue/Black, 6MT
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