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ARB = anti roll bar?
Generally...BMWs are a little backwards. You want a stiffer front bar relative to the rear. Some E46s run with no rear bar at all.
If you want to improve handling, get some slightly stiffer springs and front camber plates. The car will still roll but if you're only tracking 3-4x per year...not sure if it makes sense to get a super stiff coilover.
I had Dinan Stage 2 (springs+front bar) with GC camber plates. The car could keep up with almost anything in the corners except lightened race cars. It did have some trouble in fast switchbacks which is the only time you really feel the weight.
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2018 F30 320iX Melbourne Red
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red
2000 E36/7 Z3 Steel Blue
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