Ok. Suspension/drivetrain is something you want to do right the first time. I would advise doing a lot more research before you proceed with any of this, based on the questions you're asking.
The standard sport suspension in the 3-series is decent; I would not modify it for the sake of modifying it. If your goal is to simply adjust the height of the car and make the ride firmer/more complaint, then coilovers are a good bet. Search here to see what people are using ..... KW V1 is popular, I have no experience with them however.
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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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