What do I need to get closest to M feel?
Are you strictly talking about the ride quality? Quality tires to start. Springs and dampers or coilovers next. Those are the top contributors to ride quality.
If you also want to dial in the handling aspect, the aforementioned is a good start (and the most expensive parts). Then you can get into things like bushings, camber kits, and swaybars/endlinks.
Do all of the above, and I think your suspension will be pretty well-sorted. Probably more than a majority of people need.
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2013 F30 335i RWD ZF Melbourne Red
~Remus Sport Axleback~VRSF Chargepipe~VRSF Catless Downpipe~GPlus FMIC~HR Sport Springs~Active Autowerke OBD Flash Tune Stage 2~
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