don't touch sways until you learn more about suspension. If you want to reduce roll get good coilovers. Buy once and be done. You will want to change rear subframe bushings as well. They cause an unsettling feel when going over road bumps. M3 arms are not a must but a nice upgrade. You can get TRW parts a bit cheaper. LSD is very nice to have on wet roads and spirited driving.
GL
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