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I don't track a Xi, but the chassis is not that different than mine. Save the money on coilovers, they do no good on track. Heavy sway bars ruin the handling too. A bigger front bar, Bilstein B6 shocks, and the M3 control arm upgrade and you will be good to go. Braking is always a problem till you move to a big brake system. The OEM calipers just can't take the heat.
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2011 335i Sport, M3 control arms front/rear, ECS Tuning rear trailing arms, Bilstein HD's, StopTech BBK, Drexel LSD, Dinan camber plates, FBO's with Cobb Stage 2 tune, Corsa exhaust, 18x9 D-Force, 255/35 R-S4's
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